diff --git a/pyOneNote/FileNode.py b/pyOneNote/FileNode.py
index a5f04d0..c890922 100644
--- a/pyOneNote/FileNode.py
+++ b/pyOneNote/FileNode.py
@@ -552,7 +552,12 @@ def __init__(self, file, fileNodeChunkReference):
         self.guidFooter = uuid.UUID(bytes_le=self.guidFooter)
 
     def __str__(self):
-        return self.FileData[:128].hex()
+        fd = self.FileData
+        if isinstance(fd, (bytes, bytearray)):
+            return fd[:128].hex()
+        if isinstance(fd, str):
+            return fd[:128]
+        return repr(fd)[:128]
 
 
 class ObjectSpaceObjectPropSet:
@@ -668,7 +673,14 @@ def get_properties(self):
                         try:
                             propertyVal = self.rgData[i].Data.decode('utf-16')
                         except:
-                            propertyVal = self.rgData[i].Data.hex()
+                            data = self.rgData[i].Data
+                            if isinstance(data, (bytes, bytearray)):
+                                propertyVal = data.hex()
+                            elif isinstance(data, str):
+                                # Already decoded somewhere upstream; pass through.
+                                propertyVal = data
+                            else:
+                                propertyVal = repr(data)
                 else:
                     property_name_lower =  propertyName.lower()
                     if 'time' in property_name_lower:
@@ -759,7 +771,11 @@ def __init__(self, file, propertySet):
         self.Data, = struct.unpack('{}s'.format(self.cb), file.read(self.cb))
 
     def __str__(self):
-        return self.Data.hex()
+        if isinstance(self.Data, (bytes, bytearray)):
+            return self.Data.hex()
+        if isinstance(self.Data, str):
+            return self.Data
+        return repr(self.Data)
 
 
 class PropertyID:
diff --git a/pyOneNote/OneDocument.py b/pyOneNote/OneDocument.py
index 906a606..cad58ec 100644
--- a/pyOneNote/OneDocument.py
+++ b/pyOneNote/OneDocument.py
@@ -69,8 +69,19 @@ def get_global_identification_table(self):
     def get_json(self):
         files_in_hex = {}
         for key, file in self.get_files().items():
+            content = file['content']
+            if isinstance(content, (bytes, bytearray)):
+                content_hex = content.hex()
+            elif isinstance(content, str):
+                # Already a string; encode to bytes first to keep JSON output hex-only.
+                try:
+                    content_hex = content.encode('latin-1').hex()
+                except UnicodeEncodeError:
+                    content_hex = content.encode('utf-8', errors='replace').hex()
+            else:
+                content_hex = b''.hex()
             files_in_hex[key] = {'extension': file['extension'],
-                                 'content': file['content'].hex(),
+                                 'content': content_hex,
                                  'identity': file['identity']}
 
         res = {