use cors for limiting access

server.js

@@ -6,7 +6,9 @@ const app = express();
 const PORT = process.env.PORT || 443;
 
 // Use CORS middleware to allow requests from all origins
-app.use(cors());
+app.use(cors({
+  origin: 'https://peterwalker.xyz',
+}));
 
 // Store your API key securely in an environment variable
 const API_KEY = process.env.API_KEY || 'API_KEY not defined';