min. heroku config for react app

package.json

{
  "name": "heroku-server",
  "version": "1.0.0",
  "description": "Heroku server for React app",
  "scripts": {
    "start": "node server.js"
  },
  "dependencies": {
    "compression": "1.6.2",
    "express": "4.14.1"
  }
}

server.js

// server.js
var express = require('express');
var path = require('path');
var compression = require('compression');

var app = express();

app.use(compression());

// serve our static stuff like index.css
app.use(express.static(path.join(__dirname, 'public')));

// send all requests to index.html so browserHistory in React Router works
app.get('*', function(req, res) {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

var PORT = process.env.PORT || 8080;
app.listen(PORT, function() {
  console.log('Production Express server running at localhost:' + PORT);
});