vercel.json file created for deployment

backend/index.js

@@ -11,20 +11,21 @@ app.use(express.json());
 
 // Middleware for handling CORS POLICY
 // Option 1: Allow All Origins with Default of cors(*)
-app.use(cors());
+// app.use(cors());
 
 // Option 2: Allow Custom Origins
-// app.use(
-//   cors({
-//     origin: 'http://localhost:5173',
-//     methods: ['GET', 'POST', 'PUT', 'DELETE'],
-//     allowedHeaders: ['Content-Type'],
-//   })
-// );
+app.use(
+  cors({
+    origin: 'http://localhost:5173',
+    methods: ['GET', 'POST', 'PUT', 'DELETE'],
+    allowedHeaders: ['Content-Type'],
+    credentials: true
+  })
+);
 
 app.get("/", (request, response) => {
   //console.log(request);
-  return response.status(234).send("Welcome To MERN Stack Tutorial");
+  return response.status(234).send("Welcome to Book Store App.");
 });
 
 app.use("/books", booksRoute);

backend/vercel.json

@@ -0,0 +1,15 @@
+{
+    "version": 2,
+    "builds": [
+      {
+        "src": "index.js",
+        "use": "@vercel/node"
+      }
+    ],
+    "routes": [
+      {
+        "src": "/(.*)",
+        "dest": "index.js"
+      }
+    ]
+  }