Socket.io event

mongoose.connect('mongodb://localhost:27017/realtimeProject',{useNewUrlParser:true},
    function(err){
        if(err){
            throw err
        }
        console.log('Database connected')
        
        io.on('connection',(socket)=>{
            console.log('user connected')
            socket.on('joinRoom',(data)=>{      // data will look like => {myID: "123123"}
                console.log('user joined room')
                socket.join(data.myID)          

            })

        })

})