next.js/examples/with-pretty-url-routing/server.js

const express = require('express')
const next = require('next')
const Router = require('./routes').Router

const port = parseInt(process.env.PORT, 10) || 3000
const dev = process.env.NODE_ENV !== 'production'
const app = next({ dev })
const handle = app.getRequestHandler()

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

    Router.forEachPattern((page, pattern, defaultParams) => server.get(pattern, (req, res) =>
      app.render(req, res, `/${page}`, Object.assign({}, defaultParams, req.query, req.params))
    ))

    server.get('*', (req, res) => handle(req, res))
    server.listen(port)
  })