server.js

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

const Prismic = require('prismic-javascript')
const { apiEndpoint, linkResolver } = require('./prismic-configuration')

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

    server.get('/preview', (req, res) => {
      const token = req.query.token

      Prismic.getApi(apiEndpoint, { req })
        .then((api) => api.previewSession(token, linkResolver, '/'))
        .then((url) => {
          res.redirect(302, url)
        })
    })

    server.get('/blog/:uid', (req, res) => {
      const nextJsPage = '/post'
      const queryParams = { uid: req.params.uid }
      app.render(req, res, nextJsPage, queryParams)
    })

    server.get('/blog', (res) => {
      res.redirect(302, '/')
    })

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

    server.listen(3000, err => {
      if (err) throw err
      console.log('> Ready http://localhost:3000 <')
    })
  })
  .catch(ex => {
    console.error(ex.stack)
    process.exit(1)
  })