Host a create-react-app build folder with express

server.js

const express = require('express');
const app = express();

// 80 won't work if another process uses this port (apache/nginx)
const SERVER_PORT = 80;

app.get('*', express.static(__dirname + '/build'));

app.get('*', (req, res) => {
  res.sendFile(__dirname + '/build/index.html');
})

app.listen(SERVER_PORT);