diff --git a/.changeset/lazy-plugs-yell.md b/.changeset/lazy-plugs-yell.md
new file mode 100644
index 000000000..5647e54a0
--- /dev/null
+++ b/.changeset/lazy-plugs-yell.md
@@ -0,0 +1,6 @@
+---
+'@kubb/plugin-fetch': patch
+'@kubb/plugin-axios': patch
+---
+
+Fix the generated client failing to type-check in Node-only projects (`@types/node` without the `dom` lib). The generated `.kubb/client.ts` and `.kubb/serializers.ts` no longer reference the global `BodyInit` name, which such a project never declares. They now use a local `RequestBody` type derived from `RequestInit['body']`.
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 42a7451e0..0d9860aa6 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -303,4 +303,4 @@ jobs:
           NODE_OPTIONS: '--max_old_space_size=4096'
           KUBB_DISABLE_TELEMETRY: '1'
         run: |
-          pnpm run generate --debug
+          pnpm run generate --reporter file
diff --git a/examples/advanced/src/gen/.kubb/serializers.ts b/examples/advanced/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/advanced/src/gen/.kubb/serializers.ts
+++ b/examples/advanced/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/examples/axios/src/gen/.kubb/serializers.ts b/examples/axios/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/axios/src/gen/.kubb/serializers.ts
+++ b/examples/axios/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/examples/fetch/src/gen/.kubb/client.ts b/examples/fetch/src/gen/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/examples/fetch/src/gen/.kubb/client.ts
+++ b/examples/fetch/src/gen/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/examples/fetch/src/gen/.kubb/serializers.ts b/examples/fetch/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/fetch/src/gen/.kubb/serializers.ts
+++ b/examples/fetch/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/examples/mcp/src/gen/.kubb/serializers.ts b/examples/mcp/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/mcp/src/gen/.kubb/serializers.ts
+++ b/examples/mcp/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/examples/react-query/src/gen/.kubb/client.ts b/examples/react-query/src/gen/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/examples/react-query/src/gen/.kubb/client.ts
+++ b/examples/react-query/src/gen/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/examples/react-query/src/gen/.kubb/serializers.ts b/examples/react-query/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/react-query/src/gen/.kubb/serializers.ts
+++ b/examples/react-query/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/examples/sdk/src/gen/.kubb/client.ts b/examples/sdk/src/gen/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/examples/sdk/src/gen/.kubb/client.ts
+++ b/examples/sdk/src/gen/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/examples/sdk/src/gen/.kubb/serializers.ts b/examples/sdk/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/sdk/src/gen/.kubb/serializers.ts
+++ b/examples/sdk/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/examples/simple-single/src/gen/.kubb/client.ts b/examples/simple-single/src/gen/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/examples/simple-single/src/gen/.kubb/client.ts
+++ b/examples/simple-single/src/gen/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/examples/simple-single/src/gen/.kubb/serializers.ts b/examples/simple-single/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/simple-single/src/gen/.kubb/serializers.ts
+++ b/examples/simple-single/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/examples/swr/src/gen/.kubb/client.ts b/examples/swr/src/gen/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/examples/swr/src/gen/.kubb/client.ts
+++ b/examples/swr/src/gen/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/examples/swr/src/gen/.kubb/serializers.ts b/examples/swr/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/swr/src/gen/.kubb/serializers.ts
+++ b/examples/swr/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/examples/vue-query/src/gen/.kubb/client.ts b/examples/vue-query/src/gen/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/examples/vue-query/src/gen/.kubb/client.ts
+++ b/examples/vue-query/src/gen/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/examples/vue-query/src/gen/.kubb/serializers.ts b/examples/vue-query/src/gen/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/examples/vue-query/src/gen/.kubb/serializers.ts
+++ b/examples/vue-query/src/gen/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/packages/plugin-axios/templates/serializers.ts b/packages/plugin-axios/templates/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/packages/plugin-axios/templates/serializers.ts
+++ b/packages/plugin-axios/templates/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/packages/plugin-fetch/templates/fetch.ts b/packages/plugin-fetch/templates/fetch.ts
index ea6223eff..4ff6baf71 100644
--- a/packages/plugin-fetch/templates/fetch.ts
+++ b/packages/plugin-fetch/templates/fetch.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/packages/plugin-fetch/templates/serializers.ts b/packages/plugin-fetch/templates/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/packages/plugin-fetch/templates/serializers.ts
+++ b/packages/plugin-fetch/templates/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginAxios/default/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginAxios/default/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginAxios/default/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginAxios/default/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginAxios/paramsCasing/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginAxios/paramsCasing/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginAxios/paramsCasing/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginAxios/paramsCasing/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginAxios/sdkClass/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginAxios/sdkClass/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginAxios/sdkClass/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginAxios/sdkClass/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginAxios/sdkClassWithName/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginAxios/sdkClassWithName/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginAxios/sdkClassWithName/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginAxios/sdkClassWithName/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginAxios/sdkSingle/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginAxios/sdkSingle/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginAxios/sdkSingle/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginAxios/sdkSingle/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginAxios/zodTypes/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginAxios/zodTypes/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginAxios/zodTypes/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginAxios/zodTypes/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/default/.kubb/client.ts b/tests/3.0.x/__snapshots__/pluginFetch/default/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/default/.kubb/client.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/default/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/default/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginFetch/default/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/default/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/default/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/paramsCasing/.kubb/client.ts b/tests/3.0.x/__snapshots__/pluginFetch/paramsCasing/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/paramsCasing/.kubb/client.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/paramsCasing/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/paramsCasing/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginFetch/paramsCasing/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/paramsCasing/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/paramsCasing/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/sdkClass/.kubb/client.ts b/tests/3.0.x/__snapshots__/pluginFetch/sdkClass/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/sdkClass/.kubb/client.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/sdkClass/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/sdkClass/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginFetch/sdkClass/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/sdkClass/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/sdkClass/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/sdkClassWithName/.kubb/client.ts b/tests/3.0.x/__snapshots__/pluginFetch/sdkClassWithName/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/sdkClassWithName/.kubb/client.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/sdkClassWithName/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/sdkClassWithName/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginFetch/sdkClassWithName/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/sdkClassWithName/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/sdkClassWithName/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/sdkSingle/.kubb/client.ts b/tests/3.0.x/__snapshots__/pluginFetch/sdkSingle/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/sdkSingle/.kubb/client.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/sdkSingle/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/sdkSingle/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginFetch/sdkSingle/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/sdkSingle/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/sdkSingle/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/zodTypes/.kubb/client.ts b/tests/3.0.x/__snapshots__/pluginFetch/zodTypes/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/zodTypes/.kubb/client.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/zodTypes/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/zodTypes/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginFetch/zodTypes/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/zodTypes/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/zodTypes/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/zodTypesSdk/.kubb/client.ts b/tests/3.0.x/__snapshots__/pluginFetch/zodTypesSdk/.kubb/client.ts
index ea6223eff..4ff6baf71 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/zodTypesSdk/.kubb/client.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/zodTypesSdk/.kubb/client.ts
@@ -1,5 +1,5 @@
 import { applyHeaderStyles, defaultBodySerializer, defaultPathSerializer, defaultQuerySerializer, isDefaultJsonBody, serializeCookies } from './serializers'
-import type { HeadersInit, PathParamStyle, PathSerializer, Serializers, Styles } from './serializers'
+import type { HeadersInit, PathParamStyle, PathSerializer, RequestBody, Serializers, Styles } from './serializers'
 import { type StandardSchemaValidator, validateStandardSchema } from './standardSchema'
 
 /**
@@ -124,7 +124,7 @@ export type Deserializer<T = unknown> = (raw: unknown, contentType: string) => T
 /**
  * Serializes a request body for a single media type, registered per content type as a codec's `serialize` to encode formats the default serializer does not handle.
  */
-export type ContentBodySerializer = (body: unknown, contentType?: string) => BodyInit | undefined
+export type ContentBodySerializer = (body: unknown, contentType?: string) => RequestBody | undefined
 
 /**
  * A per-content-type codec registered on `codecs`, keyed by content type. `serialize` encodes the
@@ -238,7 +238,7 @@ export type ResolvedRequest = {
   url: string
   method: string
   headers: Record<string, string>
-  body?: BodyInit
+  body?: RequestBody
   signal?: AbortSignal
   credentials?: RequestCredentials
   options?: FetchOptions
diff --git a/tests/3.0.x/__snapshots__/pluginFetch/zodTypesSdk/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginFetch/zodTypesSdk/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginFetch/zodTypesSdk/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginFetch/zodTypesSdk/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginMcp/excludeByOperationId/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginMcp/excludeByOperationId/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginMcp/excludeByOperationId/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginMcp/excludeByOperationId/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginMcp/groupByTag/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginMcp/groupByTag/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginMcp/groupByTag/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginMcp/groupByTag/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginMcp/includeByTag/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginMcp/includeByTag/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginMcp/includeByTag/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginMcp/includeByTag/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginMcp/paramsCasing/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginMcp/paramsCasing/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginMcp/paramsCasing/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginMcp/paramsCasing/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginMcp/petStore/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginMcp/petStore/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginMcp/petStore/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginMcp/petStore/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginMcp/withClientPlugin/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginMcp/withClientPlugin/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginMcp/withClientPlugin/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginMcp/withClientPlugin/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/excludeByOperationId/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/excludeByOperationId/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/excludeByOperationId/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/excludeByOperationId/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/groupByTag/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/groupByTag/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/groupByTag/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/groupByTag/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/includeByTag/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/includeByTag/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/includeByTag/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/includeByTag/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/infinite/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/infinite/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/infinite/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/infinite/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/mutationDisabled/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/mutationDisabled/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/mutationDisabled/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/mutationDisabled/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/paramsCasing/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/paramsCasing/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/paramsCasing/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/paramsCasing/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/parserZod/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/parserZod/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/parserZod/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/parserZod/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/petStore/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/petStore/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/petStore/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/petStore/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/queryMethods/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/queryMethods/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/queryMethods/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/queryMethods/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/suspense/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/suspense/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/suspense/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/suspense/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginReactQuery/withClientPlugin/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginReactQuery/withClientPlugin/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginReactQuery/withClientPlugin/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginReactQuery/withClientPlugin/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/excludeByOperationId/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/excludeByOperationId/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/excludeByOperationId/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/excludeByOperationId/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/groupByTag/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/groupByTag/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/groupByTag/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/groupByTag/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/includeByTag/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/includeByTag/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/includeByTag/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/includeByTag/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/mutationDisabled/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/mutationDisabled/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/mutationDisabled/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/mutationDisabled/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/paramsCasing/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/paramsCasing/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/paramsCasing/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/paramsCasing/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/parserZod/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/parserZod/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/parserZod/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/parserZod/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/petStore/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/petStore/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/petStore/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/petStore/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/queryDisabled/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/queryDisabled/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/queryDisabled/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/queryDisabled/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/queryMethods/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/queryMethods/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/queryMethods/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/queryMethods/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginSwr/withClientPlugin/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginSwr/withClientPlugin/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginSwr/withClientPlugin/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginSwr/withClientPlugin/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/excludeByOperationId/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/excludeByOperationId/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/excludeByOperationId/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/excludeByOperationId/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/groupByTag/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/groupByTag/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/groupByTag/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/groupByTag/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/includeByTag/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/includeByTag/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/includeByTag/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/includeByTag/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/infinite/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/infinite/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/infinite/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/infinite/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/mutationDisabled/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/mutationDisabled/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/mutationDisabled/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/mutationDisabled/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/paramsCasing/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/paramsCasing/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/paramsCasing/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/paramsCasing/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/parserZod/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/parserZod/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/parserZod/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/parserZod/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/petStore/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/petStore/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/petStore/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/petStore/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {
diff --git a/tests/3.0.x/__snapshots__/pluginVueQuery/withClientPlugin/.kubb/serializers.ts b/tests/3.0.x/__snapshots__/pluginVueQuery/withClientPlugin/.kubb/serializers.ts
index dd2b2e1fc..d928f56c7 100644
--- a/tests/3.0.x/__snapshots__/pluginVueQuery/withClientPlugin/.kubb/serializers.ts
+++ b/tests/3.0.x/__snapshots__/pluginVueQuery/withClientPlugin/.kubb/serializers.ts
@@ -1,6 +1,12 @@
 export type HeaderValue = string | number | boolean | null | undefined | object
 export type HeadersInit = Array<[string, HeaderValue]> | Record<string, HeaderValue>
 
+/**
+ * The request body type `fetch` accepts, derived from `RequestInit` instead of the global `BodyInit`
+ * name, which a Node-only project (`@types/node` without the `dom` lib) does not declare.
+ */
+export type RequestBody = NonNullable<RequestInit['body']>
+
 /**
  * The OpenAPI query-parameter serialization style. `form` is the default; `spaceDelimited` and
  * `pipeDelimited` join arrays with a space or pipe, and `deepObject` renders objects as
@@ -67,7 +73,7 @@ export type BodyEncoding = SerializationStyle<QueryStyle> & {
  * `ArrayBuffer`, and string bodies pass through untouched. The optional `encoding` argument carries
  * the per-property OpenAPI `encoding` metadata for form bodies.
  */
-export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => BodyInit | undefined
+export type BodySerializer = (args: { body: unknown; contentType?: string; encoding?: Record<string, BodyEncoding> }) => RequestBody | undefined
 
 /**
  * The OpenAPI path-parameter serialization style. `simple` is the default and emits the bare value;
@@ -111,7 +117,7 @@ export type Styles = {
   body?: Record<string, BodyEncoding>
 }
 
-function isFormBody(body: unknown): body is BodyInit {
+function isFormBody(body: unknown): body is RequestBody {
   return (
     body instanceof FormData ||
     body instanceof URLSearchParams ||
@@ -163,7 +169,7 @@ function appendFormDataValue({ formData, key, value, contentType }: { formData:
  */
 export const defaultBodySerializer: BodySerializer = ({ body, contentType, encoding }) => {
   if (body === undefined || body === null) return undefined
-  if (isFormBody(body)) return body as BodyInit
+  if (isFormBody(body)) return body as RequestBody
   if (contentType?.includes('multipart/form-data')) {
     const formData = new FormData()
     for (const [key, value] of Object.entries(body as Record<string, unknown>)) {