Simple WebSocket Server using 'ws' library

// Import 'ws' module
const WebSocket = require('ws');

// Create WebSocket Server on port 8080
const wss = new WebSocket.Server({ port: 8080 });

// Event listener for new connections
wss.on('connection', (ws) => {
  // Event listener for incoming messages
  ws.on('message', (message) => {
    console.log('Received:', message);
    // Send a response back to the client
    ws.send('Server: ' + message);
  });
});