Socket.io

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const io = require('socket.io')(server);

io.on('connection', (socket) => {
    socket.on('message', (data) => {
        io.emit('message', data);
    });
});

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const express = require("express");
const http = require("http");
const { Server } = require("socket.io");

const app = express();
const server = http.createServer(app);
const io = new Server(server);

io.on("connection", (socket) => {
    console.log("User connected:", socket.id);

    socket.on("chat message", (msg) => {
        io.emit("chat message", msg);
    });

    socket.on("disconnect", () => {
        console.log("User disconnected");
    });
});

server.listen(3000);