Socket.io + Express JS + React JS

socket_express_react.js

var socket = require('socket.io');
var express = require('express');
var app = express();
var path = require('path');

app.use(express.static(path.join(__dirname, 'build')));

app.get('/*', function(req, res) {
  res.sendFile(path.join(__dirname, 'build', 'index.html'));
});

const server = app.listen(process.env.PORT || '80', () => console.log(`App is listening on port ${process.env.PORT || '80'}!`));

const io = socket(server);

io.on('connection', (socket) => {
  socket.on('send_event_to_front', (data) => {
      io.emit('new_message', data);
  });
});