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const express = require('express'); const http = require('http'); const socketIO = require('socket.io'); const app = express(); const server = http.createServer(app); const io = socketIO(server); io.on('connection', (socket) => { console.log('New user connected'); socket.on('new_message', (message) => { io.emit('receive_message', message); }); }); server.listen(3000, () => { console.log('Server listening on port 3000'); });