Express initial config

server.js

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

const corsConfig = {
  optionsSuccessStatus: 200,
  origin: ['http://localhost:3000', 'http://localhost:8000']
}

app = express();

const server = app.listen(3000, () => {
  const host = server.address().address;
  const port = server.address().port;

  console.info('Express now listening on http://%s:%s', host, port);
});