diff --git a/.vscode/launch.json b/.vscode/launch.json
index 60246c5573..cf70093ba4 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -420,8 +420,7 @@
       "args": [
         "--verbose",
         "designer",
-        "--frontend-dev",
-        "--base-dir=/home/wei/MyData/MyProject/ten_framework_internal_base/ten_framework/out/linux/x64/tests/ten_runtime/integration/cpp/http_basic/restful_http_app/",
+        "--base-dir=/home/wei/MyData/MyProject/ten_framework_internal_base/ten_framework/out/linux/x64/tests/ten_runtime/integration/python/aio_http_server_python/aio_http_server_python_app/",
       ],
       "preRunCommands": [
         "script import pathlib;import subprocess;import lldb;rustc_sysroot = subprocess.getoutput(\"rustc --print sysroot\");rustlib_etc = pathlib.Path(rustc_sysroot) / \"lib\" / \"rustlib\" / \"etc\";lldb.debugger.HandleCommand(f'command script import \"{rustlib_etc / \"lldb_lookup.py\"}\"');lldb.debugger.HandleCommand(f'command source -s 0 \"{rustlib_etc / \"lldb_commands\"}\"')"
diff --git a/core/src/ten_manager/designer_frontend/src/api/api.ts b/core/src/ten_manager/designer_frontend/src/api/api.ts
index afb9c51bda..8cf7f67c18 100644
--- a/core/src/ten_manager/designer_frontend/src/api/api.ts
+++ b/core/src/ten_manager/designer_frontend/src/api/api.ts
@@ -8,6 +8,8 @@ import {
   ApiResponse,
   BackendConnection,
   BackendNode,
+  FileContentResponse,
+  SaveFileRequest,
   SuccessResponse,
 } from "./interface";
 
@@ -17,6 +19,12 @@ export interface ExtensionAddon {
   api?: any;
 }
 
+export const isSuccessResponse = <T>(
+  response: ApiResponse<T>
+): response is SuccessResponse<T> => {
+  return response.status === "ok";
+};
+
 export const fetchNodes = async (): Promise<BackendNode[]> => {
   const response = await fetch(`/api/designer/v1/graphs/default/nodes`);
   if (!response.ok) {
@@ -25,7 +33,7 @@ export const fetchNodes = async (): Promise<BackendNode[]> => {
   const data: ApiResponse<BackendNode[]> = await response.json();
 
   if (!isSuccessResponse(data)) {
-    throw new Error(`Error fetching nodes: ${data.message}`);
+    throw new Error(`Failed to fetch nodes: ${data.message}`);
   }
 
   return data.data;
@@ -39,7 +47,7 @@ export const fetchConnections = async (): Promise<BackendConnection[]> => {
   const data: ApiResponse<BackendConnection[]> = await response.json();
 
   if (!isSuccessResponse(data)) {
-    throw new Error(`Error fetching connections: ${data.message}`);
+    throw new Error(`Failed to fetch connection: ${data.message}`);
   }
 
   return data.data;
@@ -63,12 +71,58 @@ export const fetchExtensionAddonByName = async (
   if (isSuccessResponse(data)) {
     return data.data;
   } else {
-    throw new Error(`Error fetching addon '${name}': ${data.message}`);
+    throw new Error(`Failed to fetch addon '${name}': ${data.message}`);
   }
 };
 
-export const isSuccessResponse = <T>(
-  response: ApiResponse<T>
-): response is SuccessResponse<T> => {
-  return response.status === "ok";
+// Get the contents of the file at the specified path.
+export const getFileContent = async (
+  path: string
+): Promise<FileContentResponse> => {
+  const encodedPath = encodeURIComponent(path);
+  const response = await fetch(`/api/designer/v1/file-content/${encodedPath}`, {
+    method: "GET",
+    headers: {
+      "Content-Type": "application/json",
+    },
+  });
+
+  if (!response.ok) {
+    throw new Error(`Failed to fetch file content: ${response.status}`);
+  }
+
+  const data: ApiResponse<FileContentResponse> = await response.json();
+
+  if (!isSuccessResponse(data)) {
+    throw new Error(`Failed to fetch file content: ${data.status}`);
+  }
+
+  return data.data;
+};
+
+// Save the contents of the file at the specified path.
+export const saveFileContent = async (
+  path: string,
+  content: string
+): Promise<void> => {
+  const encodedPath = encodeURIComponent(path);
+  const body: SaveFileRequest = { content };
+
+  const response = await fetch(`/api/designer/v1/file-content/${encodedPath}`, {
+    method: "PUT",
+    headers: {
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify(body),
+  });
+
+  if (!response.ok) {
+    throw new Error(`Failed to save file content: ${response.status}`);
+  }
+
+  const data: ApiResponse<null> = await response.json();
+
+  if (data.status !== "ok") {
+    throw new Error(`Failed to save file content: ${data.status}`);
+  }
 };
diff --git a/core/src/ten_manager/designer_frontend/src/api/interface.ts b/core/src/ten_manager/designer_frontend/src/api/interface.ts
index d6ed192633..23b3a459a2 100644
--- a/core/src/ten_manager/designer_frontend/src/api/interface.ts
+++ b/core/src/ten_manager/designer_frontend/src/api/interface.ts
@@ -48,3 +48,11 @@ export interface BackendConnection {
     }[];
   }[];
 }
+
+export interface FileContentResponse {
+  content: string;
+}
+
+export interface SaveFileRequest {
+  content: string;
+}
diff --git a/core/src/ten_manager/designer_frontend/src/components/EditorPopup/EditorPopup.scss b/core/src/ten_manager/designer_frontend/src/components/EditorPopup/EditorPopup.scss
index d7a090dd9d..9d5c2e8640 100644
--- a/core/src/ten_manager/designer_frontend/src/components/EditorPopup/EditorPopup.scss
+++ b/core/src/ten_manager/designer_frontend/src/components/EditorPopup/EditorPopup.scss
@@ -16,3 +16,16 @@
     flex-direction: column;
   }
 }
+
+.popup-confirm {
+  .confirm-dialog-content {
+    padding: 20px;
+    text-align: center;
+  }
+
+  .confirm-dialog-actions {
+    margin-top: 20px;
+    display: flex;
+    justify-content: space-around;
+  }
+}
diff --git a/core/src/ten_manager/designer_frontend/src/components/EditorPopup/EditorPopup.tsx b/core/src/ten_manager/designer_frontend/src/components/EditorPopup/EditorPopup.tsx
index 78eb581eff..2e9ab1512a 100644
--- a/core/src/ten_manager/designer_frontend/src/components/EditorPopup/EditorPopup.tsx
+++ b/core/src/ten_manager/designer_frontend/src/components/EditorPopup/EditorPopup.tsx
@@ -10,6 +10,7 @@ import Editor from "@monaco-editor/react";
 import Popup from "../Popup/Popup";
 
 import "./EditorPopup.scss";
+import { getFileContent, saveFileContent } from "../../api/api";
 
 const DEFAULT_WIDTH = 800;
 const DEFAULT_HEIGHT = 400;
@@ -29,20 +30,50 @@ interface EditorPopupProps {
   onClose: () => void;
 }
 
+interface ConfirmDialogProps {
+  message: string;
+  onConfirm: () => void;
+  onCancel: () => void;
+}
+
+const ConfirmDialog: React.FC<ConfirmDialogProps> = ({
+  message,
+  onConfirm,
+  onCancel,
+}) => {
+  return (
+    <Popup
+      title="Confirmation"
+      onClose={onCancel}
+      preventFocusSteal={true}
+      className="popup-confirm"
+      resizable={false}
+      initialWidth={400}
+      initialHeight={200}
+    >
+      <div className="confirm-dialog-content">
+        <p>{message}</p>
+        <div className="confirm-dialog-actions">
+          <button onClick={onCancel}>Cancel</button>
+          <button onClick={onConfirm}>Ok</button>
+        </div>
+      </div>
+    </Popup>
+  );
+};
+
 const EditorPopup: React.FC<EditorPopupProps> = ({ data, onClose }) => {
   const [fileContent, setFileContent] = useState(data.content);
 
+  const [showConfirmDialog, setShowConfirmDialog] = useState(false);
+  const [pendingAction, setPendingAction] = useState<null | (() => void)>(null);
+
   // Fetch the specified file content from the backend.
   useEffect(() => {
     const fetchFileContent = async () => {
       try {
-        const encodedUrl = encodeURIComponent(data.url);
-        const response = await fetch(
-          `/api/designer/v1/file-content/${encodedUrl}`
-        );
-        if (!response.ok) throw new Error("Failed to fetch file content");
-        const respData = await response.json();
-        setFileContent(respData.data.content);
+        const respData = await getFileContent(data.url);
+        setFileContent(respData.content);
       } catch (error) {
         console.error("Failed to fetch file content:", error);
       }
@@ -51,29 +82,91 @@ const EditorPopup: React.FC<EditorPopupProps> = ({ data, onClose }) => {
     fetchFileContent();
   }, [data.url]);
 
+  const saveFile = async (content: string) => {
+    try {
+      await saveFileContent(data.url, content);
+      console.log("File saved successfully");
+      // We can add UI prompts, such as displaying a success notification.
+    } catch (error) {
+      console.error("Failed to save file content:", error);
+      // We can add UI prompts, such as popping up an error notification.
+    }
+  };
+
+  const handleActionWithOptionalConfirm = (
+    action: () => void,
+    needsConfirm: boolean
+  ) => {
+    if (needsConfirm) {
+      setPendingAction(() => action);
+      setShowConfirmDialog(true);
+    } else {
+      action();
+    }
+  };
+
   return (
-    <Popup
-      title={data.title}
-      onClose={onClose}
-      preventFocusSteal={true}
-      className="popup-editor"
-      resizable={true}
-      initialWidth={DEFAULT_WIDTH}
-      initialHeight={DEFAULT_HEIGHT}
-    >
-      <Editor
-        height="100%"
-        defaultLanguage="json"
-        value={fileContent}
-        options={{
-          readOnly: false,
-          automaticLayout: true,
-        }}
-        onMount={(editor) => {
-          editor.focus(); // Set the keyboard focus to the editor.
-        }}
-      />
-    </Popup>
+    <>
+      <Popup
+        title={data.title}
+        onClose={onClose}
+        preventFocusSteal={true}
+        className="popup-editor"
+        resizable={true}
+        initialWidth={DEFAULT_WIDTH}
+        initialHeight={DEFAULT_HEIGHT}
+      >
+        <Editor
+          height="100%"
+          defaultLanguage="json"
+          value={fileContent}
+          options={{
+            readOnly: false,
+            automaticLayout: true,
+          }}
+          onChange={(value) => setFileContent(value || "")}
+          onMount={(editor) => {
+            editor.focus(); // Set the keyboard focus to the editor.
+
+            editor.addAction({
+              id: "save-file",
+              label: "Save",
+              contextMenuGroupId: "navigation",
+              contextMenuOrder: 1.5,
+              run: async (ed) => {
+                // When the user clicks this menu item, first display a
+                // confirmation popup.
+                handleActionWithOptionalConfirm(
+                  () => {
+                    // Confirm before saving.
+                    const currentContent = ed.getValue();
+                    setFileContent(currentContent);
+                    saveFile(currentContent);
+                  },
+                  true // Display a confirmation popup.
+                );
+              },
+            });
+          }}
+        />
+      </Popup>
+
+      {/* Conditional Rendering Confirmation Popup. */}
+      {showConfirmDialog && pendingAction && (
+        <ConfirmDialog
+          message="Are you sure you want to save this file?"
+          onConfirm={() => {
+            setShowConfirmDialog(false);
+            pendingAction();
+            setPendingAction(null);
+          }}
+          onCancel={() => {
+            setShowConfirmDialog(false);
+            setPendingAction(null);
+          }}
+        />
+      )}
+    </>
   );
 };
 
diff --git a/core/src/ten_manager/src/designer/file_content/mod.rs b/core/src/ten_manager/src/designer/file_content/mod.rs
index b6c45e87ab..56caaf985e 100644
--- a/core/src/ten_manager/src/designer/file_content/mod.rs
+++ b/core/src/ten_manager/src/designer/file_content/mod.rs
@@ -5,6 +5,7 @@
 // Refer to the "LICENSE" file in the root directory for more information.
 //
 use std::fs;
+use std::path::Path;
 use std::sync::{Arc, RwLock};
 
 use actix_web::{web, HttpResponse, Responder};
@@ -46,3 +47,60 @@ pub async fn get_file_content(
         }
     }
 }
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct SaveFileRequest {
+    content: String,
+}
+
+pub async fn save_file_content(
+    path: web::Path<String>,
+    req: web::Json<SaveFileRequest>,
+    _state: web::Data<Arc<RwLock<DesignerState>>>,
+) -> HttpResponse {
+    let file_path_str = path.into_inner();
+    let content = &req.content; // Access the content field.
+
+    let file_path = Path::new(&file_path_str);
+
+    // Attempt to create parent directories if they don't exist.
+    if let Some(parent) = file_path.parent() {
+        if let Err(e) = fs::create_dir_all(parent) {
+            eprintln!(
+                "Error creating directories for {}: {}",
+                parent.display(),
+                e
+            );
+            let response = ApiResponse {
+                status: Status::Fail,
+                data: (),
+                meta: None,
+            };
+            return HttpResponse::BadRequest().json(response);
+        }
+    }
+
+    match fs::write(file_path, content) {
+        Ok(_) => {
+            let response = ApiResponse {
+                status: Status::Ok,
+                data: (),
+                meta: None,
+            };
+            HttpResponse::Ok().json(response)
+        }
+        Err(err) => {
+            eprintln!(
+                "Error writing file at path {}: {}",
+                file_path.display(),
+                err
+            );
+            let response = ApiResponse {
+                status: Status::Fail,
+                data: (),
+                meta: None,
+            };
+            HttpResponse::BadRequest().json(response)
+        }
+    }
+}
diff --git a/core/src/ten_manager/src/designer/mod.rs b/core/src/ten_manager/src/designer/mod.rs
index 32b6cfebff..d54ea3eacf 100644
--- a/core/src/ten_manager/src/designer/mod.rs
+++ b/core/src/ten_manager/src/designer/mod.rs
@@ -90,5 +90,9 @@ pub fn configure_routes(
             "/api/designer/v1/file-content/{path}",
             web::get().to(file_content::get_file_content),
         )
+        .route(
+            "/api/designer/v1/file-content/{path}",
+            web::put().to(file_content::save_file_content),
+        )
         .route("/ws/terminal", web::get().to(ws_terminal));
 }