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)
})