diff --git a/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/__init__.py b/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/__init__.py
index d5ca784..658ac96 100644
--- a/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/__init__.py
+++ b/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/__init__.py
@@ -41,6 +41,7 @@
     UserContext,
 )
 
+from .json_sanitize import install_json_sanitize
 from .path_proxy import DynamicPathProxy
 from .folder_paths_patch import install_folder_paths_patch
 from .execution_patch import install_execution_patch
@@ -61,6 +62,8 @@
 
 if ENABLE_PLUGIN:
     try:
+        # JSON 补丁必须最早安装（在 server 处理 /object_info 之前生效）
+        install_json_sanitize()
         # Install all patches
         install_folder_paths_patch()
         install_execution_patch()
diff --git a/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/json_sanitize.py b/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/json_sanitize.py
new file mode 100644
index 0000000..fcb4acc
--- /dev/null
+++ b/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/json_sanitize.py
@@ -0,0 +1,72 @@
+"""
+JSON 序列化辅助 - 将 DynamicPathProxy 转为字符串
+
+ComfyUI /object_info 经 aiohttp.web.json_response → json.dumps；
+仅 patch web.json_response 不够（server 模块可能已绑定旧引用）。
+同时 patch json.JSONEncoder.default，确保所有标准 json.dumps 都能序列化 Proxy。
+"""
+
+import json
+
+from aiohttp import web
+
+from .path_proxy import DynamicPathProxy
+
+_installed = False
+_original_encoder_default = None
+_original_json_response = None
+
+
+def sanitize_for_json(obj):
+    """递归将 DynamicPathProxy 转为 str（按当前 user 上下文解析路径）。"""
+    if isinstance(obj, DynamicPathProxy):
+        return str(obj)
+    if isinstance(obj, dict):
+        return {sanitize_for_json(k): sanitize_for_json(v) for k, v in obj.items()}
+    if isinstance(obj, (list, tuple)):
+        return [sanitize_for_json(x) for x in obj]
+    return obj
+
+
+def install_json_sanitize():
+    """
+    安装 JSON 序列化补丁（幂等）。
+
+    1. json.JSONEncoder.default — 覆盖 aiohttp 内部的 json.dumps(data)
+    2. aiohttp.web.json_response — 双保险，先 sanitize 再 dumps
+    3. server.web.json_response — 若 server 已 import，同步替换
+    """
+    global _installed, _original_encoder_default, _original_json_response
+
+    if _installed:
+        return
+
+    _original_encoder_default = json.JSONEncoder.default
+
+    def patched_encoder_default(self, o):
+        if isinstance(o, DynamicPathProxy):
+            return str(o)
+        return _original_encoder_default(self, o)
+
+    json.JSONEncoder.default = patched_encoder_default
+
+    _original_json_response = web.json_response
+
+    def json_response_safe(data, **kwargs):
+        return _original_json_response(sanitize_for_json(data), **kwargs)
+
+    json_response_safe._comfyui_user_json_patched = True
+    web.json_response = json_response_safe
+
+    try:
+        import server  # type: ignore
+
+        server.web.json_response = json_response_safe
+    except ImportError:
+        pass
+
+    _installed = True
+    print("[ComfyUI-Multi-User] JSON sanitize 已安装 (JSONEncoder.default + json_response)")
+
+
+__all__ = ['sanitize_for_json', 'install_json_sanitize']
diff --git a/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/server_patch.py b/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/server_patch.py
index 448368c..f12a121 100644
--- a/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/server_patch.py
+++ b/src/code/comfyui/custom_nodes/FunArt-ComfyUI-Multi-User/server_patch.py
@@ -8,6 +8,7 @@
 from aiohttp import web
 
 from .context import set_current_user, clear_current_user
+from .json_sanitize import install_json_sanitize
 
 _hook_installed = False
 
@@ -47,6 +48,23 @@ def install_server_middleware():
     try:
         import server  # type: ignore
 
+        install_json_sanitize()
+
+        # Save original add_routes method
+        _original_add_routes = server.PromptServer.add_routes
+
+        def patched_add_routes(self):
+            """
+            Patched add_routes - wraps handlers after route registration.
+            """
+            # Call original add_routes first
+            result = _original_add_routes(self)
+
+            # Wrap all route handlers
+            wrap_route_handlers(self.app)
+
+            return result
+
         instance = server.PromptServer.instance
         if instance is None:
             print("[ComfyUI-Multi-User] ⚠️ PromptServer instance not yet created, deferring middleware install")