server.js

const express = require('express');
const app = express();
const server = require('http').Server(app);
const io = require('socket.io')(server);
const { v4: uuidv4 } = require('uuid');
const { ExpressPeerServer } = require('peer');
const peerServer = ExpressPeerServer(server, {
    debug: true
});

// Setting view engine to ejs
app.set('view engine', 'ejs');
// Setting the public folder, so that we can access it directly with the filename
app.use(express.static('public'));

app.use('/peerjs', peerServer);
app.get('/', (req, res) => {
    res.redirect(`/${uuidv4()}`);
})

app.get('/:room', (req, res) => {
    res.render('room', { roomId: req.params.room });
})

io.on('connection', socket => {
    socket.on('join-room', (roomId, userId) => {
        socket.join(roomId);
        socket.to(roomId).broadcast.emit('user-connected', userId);
    });

    socket.on('message', (roomId, msg) => {
        socket.to(roomId).broadcast.emit('createMessage', msg);
    });
})

server.listen(3030);