@duplojs/form

@duplojs/form is a structure-first, strongly typed form library for Vue.

Instead of wiring forms manually (value collection, validation plumbing, complex UI flows), you compose a FormField tree and let the library handle the form mechanics.

Provide your input components or use the ones already available, compose layouts, and you get a powerful form engine with reusable rendering and strong typing.

What’s inside?

• createForm(...): creates a reusable useForm(...) initializer bound to your templates.
• createInput(...): turns your Vue components into reusable form inputs.
• Built-in layouts to model real-world forms:
  • useMultiLayout
  • useRepeatLayout
  • useUnionLayout
  • useStepLayout
  • useSectionLayout
  • useSlotLayout
  • useCheckLayout
  • useDisabledLayout
• Default implementations:
  • @duplojs/form/vueGrid + @duplojs/form/vueGrid.css
  • @duplojs/form/vueDesignSystem + @duplojs/form/vueDesignSystem.css

Why this approach

• Structure-first approach: define the form structure once, then compose and reuse it.
• Logic is built-in: nested layouts, complex branches, step forms, and conditional disabling.
• Design freedom: keep your own design system and visual identity.
• Contract-based inputs: if your component respects the minimal input contract, it becomes a first-class form input with createInput(...).
• End-to-end typing: from declared fields to checked output value.

Core concepts

• Inputs and layouts both return FormField, so everything composes the same way.
• A form is initialized from one root FormField.
• currentValue is the live raw form state.
• check() executes validation for the full tree and returns checked output (or errors).
• Templates control rendering only, not business logic.
• Field validation is defined through dataParser; during check(), these parsers are executed and drive validation errors/messages.

Install

npm install @duplojs/form@0 @duplojs/utils@1

Documentation

https://form.duplojs.dev