Custom server.js for NextJS in order to proxy requests to backend api

server.js

/**
 * Custom server.js for NextJS in order to proxy requests to backend api
 *
 * Create server.js in root dir, adjust scripts in package.json
 *
 *  "scripts": {
 *    "dev": "node server.js",
 *    "start": "NODE_ENV=production node server.js"
 *  }
 */
const express = require('express');
const proxy = require('express-http-proxy');
const http = require('http');
const next = require('next');
const dotenv = require('dotenv');
dotenv.config();

const dev = process.env.NODE_ENV !== 'production';
const app = next({
  dev,
});
const handle = app.getRequestHandler();

app.prepare().then(() => {
  const server = express();

  server.use('/api/books', proxy('https://api.domain.net/v1/books'));
  
  // Let NextJS handle non matching routes
  server.get('*', handle);

  const port = process.env.PORT || 3000;
  http.createServer(server).listen(port, () => {
    console.log(`> listening on port ${port} 🙌`);
  });
});