server.js

'use strict';

const fs = require('node:fs');
const http = require('node:http');
const Websocket = require('websocket').server;

const index = fs.readFileSync('./index.html', 'utf8');

const server = http.createServer((req, res) => {
  res.writeHead(200);
  res.end(index);
});

server.listen(80, () => {
  console.log('Listen port 80');
});

const ws = new Websocket({
  httpServer: server,
  autoAcceptConnections: false
});

const clients = [];

ws.on('request', (req) => {
  const connection = req.accept('', req.origin);
  clients.push(connection);
  console.log('Connected ' + connection.remoteAddress);
  connection.on('message', (message) => {
    const dataName = message.type + 'Data';
    const data = message[dataName];
    console.log('Received: ' + data);
    clients.forEach((client) => {
      if (connection !== client) {
        client.send(data);
      }
    });
  });
  connection.on('close', (reasonCode, description) => {
    console.log('Disconnected ' + connection.remoteAddress);
    console.dir({ reasonCode, description });
  });
});