fixing errors

app/api/backend.mjs

@@ -8,9 +8,21 @@ import ProjectNameModel from './schema.mjs'; // Import your Mongoose model
 
 const app = express(); // Initialize Express app
 
-// Middleware setup
+// Allow specific origins (replace with your Vercel frontend URL)
+const allowedOrigins = ['https://blockscan-swin.vercel.app'];
+
+const corsOptions = {
+  origin: function (origin, callback) {
+    if (allowedOrigins.indexOf(origin) !== -1 || !origin) {
+      callback(null, true);
+    } else {
+      callback(new Error('Not allowed by CORS'));
+    }
+  },
+};
+
+app.use(cors(corsOptions)); // Use CORS with the options
 app.use(express.json()); // Parse JSON requests
-app.use(cors({ origin: '*' })); // Enable CORS for all origins
 
 // MongoDB connection
 const mongoUrl = "mongodb+srv://leviron:[email protected]/BlockScanDB?retryWrites=true&w=majority&appName=BlockScan";

package.json

@@ -2,16 +2,14 @@
   "name": "my-next-app",
   "version": "0.1.0",
   "private": true,
-
   "scripts": {
-  "dev": "npx concurrently \"npm:dev-frontend\" \"npm:dev-backend\"",
-  "dev-frontend": "next dev",
-  "dev-backend": "node app/api/backend.mjs",
-  "build": "next build",
-  "start": "next start",
-  "lint": "next lint"
-},
-
+    "dev": "npx concurrently \"npm:dev-frontend\" \"npm:dev-backend\"",
+    "dev-frontend": "next dev",
+    "dev-backend": "node app/api/backend.mjs",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
   "dependencies": {
     "@radix-ui/react-dialog": "^1.1.2",
     "@radix-ui/react-icons": "^1.3.0",