index.js

const app = require('express')()
const server = require('http').Server(app)
const io = require('socket.io')(server)

const port = 3000

server.listen(port, ()=>{
    console.log(`Server is running on port ${port}`)
})

app.get('/', (req, res)=>{
    res.sendFile(__dirname + '/public/index.html')
    
})
app.get('/javascript', (req, res)=>{
    res.sendFile(__dirname + '/public/javascript.html')
    
})
app.get('/css', (req, res)=>{
    res.sendFile(__dirname + '/public/css.html')
    
})
app.get('/html', (req, res)=>{
    res.sendFile(__dirname + '/public/html.html')
    
})

// tech namespace
const tech = io.of('/tech')
tech.on('connection', (socket)=>{
    socket.on('join', (data)=>{
        socket.join(data.room)
        tech.in(data.room).emit('message', `New user joined ${data.room} room!`)
    })


    socket.on('message', (data)=>{
        console.log(`message : ${data.msg}`)
        tech.in(data.room).emit('message', data.msg)
    })

    socket.on('disconnect', ()=>{
        console.log('user disconnected')

        tech.emit('message', 'user disconnected')
    })
})