From 045cf1016dd8273b79e12e624a665382f8e99c9e Mon Sep 17 00:00:00 2001
From: uysus11-web <uysus11@gmail.com>
Date: Fri, 24 Jul 2026 21:18:58 +0700
Subject: [PATCH] Update editUsername.controller.ts

---
 backend/src/controllers/editUsername.controller.ts | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/backend/src/controllers/editUsername.controller.ts b/backend/src/controllers/editUsername.controller.ts
index 3a04fb9..ccdf39d 100644
--- a/backend/src/controllers/editUsername.controller.ts
+++ b/backend/src/controllers/editUsername.controller.ts
@@ -22,6 +22,14 @@ const EditUsernameController = async (
         .status(400)
         .json({ success: false, message: "Please enter your new username" });
       
+    // --- ĐOẠN CODE BẠN ĐÓNG GÓP THÊM VÀO ---
+    if (newUsername.length < 3 || newUsername.length > 20) {
+      return res
+        .status(400)
+        .json({ success: false, message: "Username must be between 3 and 20 characters" });
+    }
+    // --------------------------------------
+
     const existingUser = await User.findOne({ clientId });
 
     if (!existingUser)
@@ -39,4 +47,4 @@ const EditUsernameController = async (
   }
 };
 
-export default EditUsernameController;
\ No newline at end of file
+export default EditUsernameController;