app.js

const express = require('express');
// const logger = require('morgan');
const path = require('path');
const cookieParser = require('cookie-parser');
const bodyParser = require('body-parser');
const next = require('./next');

const app = express();
// Put in place textbook middlewares for express.
if (process.env.NODE_ENV !== 'production') {
  // app.use(logger('dev'));
}
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use('/', express.static(path.join(__dirname, 'public')));

const start = async (port) => {
  // Couple Next.js with our express server.
  // app and handle from "next" will now be available as req.app and req.handle.
  await next(app);

  // Normal routing, if you need it.
  // Use your SSR logic here.
  // Even if you don't do explicit routing the pages inside app/pages
  // will still get rendered as per their normal route.
  app.get('/main', (req, res) => req.app.render(req, res, '/', {
    routeParam: req.params.routeParam
  }));

  app.listen(port);
};

// Start the express server.
start(9001);