server.js

const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');
const path = require('path');

if (process.env.NODE_ENV !== 'production') require('dotenv').config();

const app = express();
const port = process.env.PORT || 5000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.use(cors());

const configureRoutes = require('./routes');

configureRoutes(app);

if (process.env.NODE_ENV === 'production') {
  // Serve any static files
  app.use(express.static(path.join(__dirname, 'client/build')));
  // Handle React routing, return all requests to React app
  app.get('*', function(req, res) {
    res.sendFile(path.join(__dirname, 'client/build', 'index.html'));
  });
}

app.listen(port, error => {
  if (error) throw error;
  console.log('Server running on port ' + port);
});