Minimum NodeJS Socket.io server

server.js

var io = require('socket.io')(1337);

console.log('Socket listen on port 1337 : ');

io.on('connection',  socket => {
  console.log('Client connected');

  socket.on('message', msg => {
    console.log(`New message : ${msg}`);
  });

  socket.on('disconnect', () => {
    console.log('Client disconnected');
  });
});