server.js

// This file doesn't go through babel or webpack transformation.
// Make sure the syntax and sources this file requires are compatible with the current node version you are running
// See https://github.com/zeit/next.js/issues/1245 for discussions on Universal Webpack or universal Babel
const express = require('express');
const { parse } = require('url');
const next = require('next');

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

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

  server.get('/fact/:id', (req, res) => {
    const actualPage = '/fact';
    const queryParams = { id: req.params.id };
    app.render(req, res, actualPage, queryParams);
  });

  server.get('*', (req, res) => {
    return handle(req, res);
  });

  server.listen(3000, err => {
    if (err) throw err;
    console.log('> Ready on http://localhost:3000');
  });
});