Create app.js

app.js

@@ -0,0 +1,40 @@
+const express = require('express');
+const os = require('os');
+
+const app = express();
+
+app.get('/', (req, res) => {
+  res.send('Hello, Express.js!');
+});
+
+app.get('/about', (req, res) => {
+  res.send('About page');
+});
+
+app.get('/users/:userId', (req, res) => {
+  const userId = req.params.userId;
+  res.send(`User ID: ${userId}`);
+});
+
+const PORT = process.env.PORT || 3000;
+
+// Get local IP address
+const networkInterfaces = os.networkInterfaces();
+let localIpAddress = '';
+
+Object.keys(networkInterfaces).forEach(interfaceName => {
+  networkInterfaces[interfaceName].forEach(network => {
+    if (network.family === 'IPv4' && !network.internal) {
+      localIpAddress = network.address;
+    }
+  });
+});
+
+// If no local IP address found, fallback to localhost
+if (!localIpAddress) {
+  localIpAddress = 'localhost';
+}
+
+app.listen(PORT, localIpAddress, () => {
+  console.log(`Server is running on http://${localIpAddress}:${PORT}`);
+});