index.js

const express = require('express');
const app = express();
const path = require('path');
const httpProxy = require('http-proxy');
const renderer = require('./renderer');

app.get(/^\/([^a]|a[^p]|ap[^i]|api[^/]).*$|^\/$/, renderer);

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

const proxy = httpProxy.createProxyServer();

app.use('/api', (req, res) => {
    proxy.web(req, res, {target: 'http://localhost:8081'});
});

app.listen(8080, () => {
    console.log('App Server is listening on http://localhost:8080');
})