server.js

let app = require('express')();
let http = require('http').Server(app);
let io = require('socket.io')(http);
app.get('/', (req,res) => {
  res.sendFile(__dirname + '/index.html');
})

http.listen(3000,() => {
  console.log('connection done')
})

io.on('connection', (socket) => {
  console.log('there is a connection')

  io.emit('connections', Object.keys(io.sockets.connected).length)

  socket.on('Created', (data) => {
    socket.broadcast.emit('Created', (data))
  })
  socket.on('chat-message', (data) => {
    socket.broadcast.emit('chat-message', (data))
  })
  socket.on('typing', (data) => {
    socket.broadcast.emit('typing', (data))
  })
  socket.on('stopTyping', (data) => {
    socket.broadcast.emit('stopTyping', (data))
  })
  socket.on('joined', (data) => {
    socket.broadcast.emit('joined', (data))
  })
  socket.on('leaved', (data) => {
    socket.broadcast.emit('leaved', (data))
  })
})