main.js

import net from 'node:net'

const allClients = {};
let countUser = 0;
const server = net.createServer((socket) => {
    // connection msg on server
    console.log(`Connected-to:: ${socket.remoteAddress}`);
    countUser++;
    const uniqueUser = `user${countUser}`;
    allClients[uniqueUser] = socket; // saving socket on the allClients object

    socket.write(`You assigned username: ${uniqueUser}`);
    // sending ack to client

    socket.on("data", (data) => {

        console.log(`Msg from ${uniqueUser}: ${data.toString()}`);
        Object.keys(allClients).forEach((key) => {
            if (data.toString().includes(key)) {
                if (key !== uniqueUser) {
                    allClients[key].write(String(data).replace(key, ""));
                }
            }
        })

    })

    socket.on("end", () => {
        socket.write("Ok Data received.")
        console.log("data ended!");
    });
});

process.stdin;
process.stdin.on("data", (data) => {
    Object.keys(allClients).forEach((key) => {
        allClients[key].write(data);
    })
})

server.listen(3000, '0.0.0.0')