Chatapp/nodejs.js at main · mohdarsh786/Chatapp · GitHub

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// Node server which will handle socket io connections
const io = require("socket.io")(8000, {
    cors: {
        origin: "http://127.0.0.1:5500",
        methods: ["GET", "POST"]
    }
});


const users = {};

io.on('connection', socket => {
    // When a new user joins
    socket.on('new-user-joined', name => {
        console.log("New user", name);
        users[socket.id] = name;
        socket.broadcast.emit('user-joined', name);
    });

        socket.on('disconnect', () => {
            const name = users[socket.id];
            delete users[socket.id];
            if (name) {
                console.log(name + ' left');
            }
    });

    // When a user sends a message
    socket.on('send', message => {
        socket.broadcast.emit('receive', {message:    message, name: users[socket.id]})
    });
    socket.on('disconnect', message => {
        socket.broadcast.emit('left', users[socket.id]);
        delete users[socket.id];
    });

})