Express / Node.js

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

const PORT = process.env.PORT || process.env.APP_PORT || 3000;

app.use(cors({
  origin: [
    `https://${process.env.APP_DOMAIN}`,
    'http://localhost:3000',
  ]
}));

app.listen(PORT, '0.0.0.0', () => {
  console.log(`Listening on ${PORT}`);
});

# BUILD_COMMANDS
npm install && npm run build

# RUN_COMMAND
node server.js
# or: npm start