const express = require('express'); const app = express(); const server = require('http').createServer(app); const io = require('socket.io')(server); const port = process.env.PORT || 5000; app.use(express.static(__dirname + '/fiddle_public')); io.on('connection', socket => { console.log(`connect ${socket.id}`); socket.emit('hello', 1, '2', { hello: 'you' }); socket.on('disconnect', () => { console.log(`disconnect ${socket.id}`); }); }); server.listen(port, () => console.log(`server listening on port ${port}`));