diff --git a/routes/internal/internal_routes.py b/routes/internal/internal_routes.py
index d0eff0c75..cbc61d4d7 100644
--- a/routes/internal/internal_routes.py
+++ b/routes/internal/internal_routes.py
@@ -1,18 +1,65 @@
 from aiohttp import web
+from typing import Optional, Dict, List
+from folder_paths import models_dir, user_directory, output_directory
+import os 
 
 class InternalRoutes:
     def __init__(self):
-        self.routes = web.RouteTableDef()
-        self._app = None
+        self.routes: web.RouteTableDef = web.RouteTableDef()
+        self._app: Optional[web.Application] = None
+        self.allowed_directories: Dict[str, str] = {
+            "models": models_dir,
+            "user": user_directory,
+            "output": output_directory
+        }
 
     def setup_routes(self):
-        @self.routes.get('/files/')
-        async def internal_test(request):
-            return web.json_response({"message": "Internal route is working"})
+        @self.routes.get('/files')
+        async def list_files(request):
+            directory_key = request.query.get('directory', '')
+            if directory_key not in self.allowed_directories:
+                return web.json_response({"error": "Invalid directory key"}, status=400)
+
+            directory_path = self.allowed_directories[directory_key]
+
+            try:
+                file_list = self._get_file_list(directory_path)
+                return web.json_response({"files": file_list})
+            except FileNotFoundError:
+                return web.json_response({"error": "Directory not found"}, status=404)
+            except Exception as e:
+                return web.json_response({"error": str(e)}, status=500)
+
+    def _get_file_list(self, directory: str) -> List[Dict[str, Optional[str]]]:
+        if not os.path.exists(directory):
+            raise FileNotFoundError(f"Directory not found: {directory}")
+
+        file_list = []
+        for root, dirs, files in os.walk(directory):
+            for name in files:
+                file_path = os.path.join(root, name)
+                relative_path = os.path.relpath(file_path, directory)
+                file_list.append({
+                    "name": name,
+                    "path": relative_path,
+                    "type": "file",
+                    "size": os.path.getsize(file_path)
+                })
+            for name in dirs:
+                dir_path = os.path.join(root, name)
+                relative_path = os.path.relpath(dir_path, directory)
+                file_list.append({
+                    "name": name,
+                    "path": relative_path,
+                    "type": "directory",
+                    "size": None
+                })
+        return file_list
+
 
     def get_app(self):
         if self._app is None:
             self._app = web.Application()
             self.setup_routes()
             self._app.add_routes(self.routes)
-        return self._app
\ No newline at end of file
+        return self._app