routes/index.js

var express = require('express');
var router = express.Router();
var path = require('path');

// /* GET home page. */
// router.get('/', function (req, res, next) {
//     console.log("Request get index");
//     res.render('index', { title: 'Express' });
// });

/* GET React App */
router.get(['/app', '/app/*'], function (req, res, next) {
    res.sendFile(path.join(__dirname, '../public', 'index.html'));
});

module.exports = router;