diff --git a/server.js b/server.js
index 80ef9c702411684e66ef659bb28ce5ef89ed3a05..685c25f8c4cbe4ecf4bf3ba03b86429188e67527 100644
--- a/server.js
+++ b/server.js
@@ -94,6 +94,7 @@ app.get("/cart", isLoggedIn, async (req, res) => {
         res.status(500).send("Error loading cart.");
     }
 });
+
 app.post("/cart/add", async (req, res) => {
     if (!req.session.user) {
         return res.status(401).json({ message: "Please login first." });
@@ -135,21 +136,48 @@ app.post("/cart/add", async (req, res) => {
 //อัปเดตตะกร้าสินค้า
 app.post("/cart/update", async (req, res) => {
     try {
+        console.log("Request Body:", req.body); // Debug input
+
         const { cartItemId, quantity } = req.body;
+
+        // เช็คว่ามีค่าครบถ้วน
+        if (!cartItemId || quantity === undefined) {
+            return res.status(400).json({ message: "Missing cartItemId or quantity" });
+        }
+
+        // เช็คว่า quantity เป็นค่าที่ถูกต้อง
         if (quantity < 1) {
             return res.status(400).json({ message: "Quantity must be at least 1" });
         }
 
-        await pool.execute("UPDATE cart_items SET quantity = ? WHERE id = ?", [quantity, cartItemId]);
+        // ตรวจสอบว่ามี cartItemId อยู่ในฐานข้อมูลจริงหรือไม่
+        const [existingItem] = await pool.execute(
+            "SELECT * FROM cart_items WHERE id = ?",
+            [cartItemId]
+        );
+
+        if (existingItem.length === 0) {
+            return res.status(404).json({ message: "Cart item not found" });
+        }
+
+        // อัปเดตจำนวนสินค้าในตะกร้า
+        await pool.execute(
+            "UPDATE cart_items SET quantity = ? WHERE id = ?",
+            [quantity, cartItemId]
+        );
+
+        console.log("Updated Cart:", { cartItemId, quantity }); // Debug success
         res.json({ success: true, message: "Cart updated" });
+
     } catch (error) {
         console.error("Update error:", error);
-        res.status(500).json({ message: "Update failed" });
+        res.status(500).json({ message: "Update failed", error });
     }
 });
 
 
 
+
 // Register
 app.get('/register', (req, res) => {
     res.render('register');
@@ -205,15 +233,6 @@ app.post("/login", async (req, res) => {
     }
 });
 
-// Logout
-app.get("/logout", (req, res) => {
-    req.session.destroy(err => {
-        if (err) return res.status(500).json({ message: "Logout failed." });
-        res.clearCookie('connect.sid', { path: '/' });  // เคลียร์ Cookie อย่างถูกต้อง
-        res.redirect("/login");
-    });
-});
-
 // ค้นหาสินค้า
 app.get("/search", async (req, res) => {
     const searchQuery = req.query.query;
@@ -228,6 +247,16 @@ app.get("/search", async (req, res) => {
     }
 });
 
+
+// Logout
+app.get("/logout", (req, res) => {
+    req.session.destroy(err => {
+        if (err) return res.status(500).json({ message: "Logout failed." });
+        res.clearCookie('connect.sid', { path: '/' });  // เคลียร์ Cookie อย่างถูกต้อง
+        res.redirect("/login");
+    });
+});
+
 // Error Handler
 app.use((err, req, res, next) => {
     console.error("Unhandled error:", err);