server.js

// Import http and ws modules
const http = require('http');
const WebSocket = require('ws');

// Create an http server
const server = new http.createServer();

// Create a WebSocket server by wrapping the http server
const wss = new WebSocket.Server({ server });

// Setup a listener for new connections
wss.on('connection', (ws) => {
  
    // When a client connects, we listen for messages from that client
    ws.on('message', (data) => {
      
        // Parse the message payload and log it to the console
        console.log(JSON.parse(data));
        
        // When a message is sent by a client, simply loop through all connected clients and forward the message
        // except the client who sent the message
        wss.clients.forEach((client) => {
            if (client !== ws && client.readyState === WebSocket.OPEN) {
                client.send(data);
            }
        });
    });
});

// Start the server on port 8081
server.listen(8081, () => {
    console.log('Chat server now running on http://localhost:8081');
});