server.js

const sslRedirect = require('heroku-ssl-redirect')
const express = require('express')
// const { join } = require('path');
// const { parse } = require('url');
const next = require('next')
const port = parseInt(process.env.PORT, 10) || 3000
const app = next({ dev: process.env.NODE_ENV !== 'production' })
const handle = app.getRequestHandler()

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

  server.use(sslRedirect())

  const errorHandler = (err, req, res, next) => {
    if (res.headersSent) {
      return next(err)
    }
    const { status } = err
    res.status(status).json(err)
  }

  server.use(errorHandler)

  server.get('/welcome/profile/:page/:subPage', (req, res) => {
    const { page, subPage } = req.params
    const slug = subPage ? getSlug(page, subPage) : getSlug(page)
    app.render(req, res, `/welcome`, { slug })
  })

  server.get('/welcome/profile/:page', (req, res) => {
    const slug = getSlug(req.params.page)
    app.render(req, res, `/welcome`, { slug })
  })

  server.get('/welcome/:page', (req, res) => {
    const slug = getSlug(req.params.page)
    app.render(req, res, `/welcome`, { slug })
  })

  server.get('/user/:userId', (req, res) => {
    const { userId } = req.params
    app.render(req, res, `/home`, { user: userId })
  })

  server.get('/profile/user/:userId', (req, res) => {
    const { userId } = req.params
    app.render(req, res, '/profile', { user: userId })
  })

  server.get('/profile/:category/user/:userId', (req, res) => {
    const { category, userId } = req.params
    const slug = category === 'chat' ? 'chats' : category
    app.render(req, res, '/profile', { slug, user: userId })
  })

  server.get('/profile/:slug', (req, res) => {
    const { slug } = req.params
    const slugObj = {
      slug: slug === 'chat' ? 'chats' : slug
    }
    app.render(req, res, `/profile`, slugObj)
  })

  server.get('/home/user/:userId', (req, res) => {
    const { userId } = req.params
    app.render(req, res, '/home', { user: userId })
  })

  server.get('/reset/:token', (req, res) => {
    const { token } = req.params
    app.render(req, res, '/reset', { token })
  })

  server.get('*', (req, res) => {
    // const parsedUrl = parse(req.url, true);
    // const { pathname } = parsedUrl;
    // // handle GET request to /service-worker.js
    // if (pathname === '/service-worker.js') {
    // 	const filePath = join(__dirname, '.next', pathname);

    // 	app.serveStatic(req, res, filePath);
    // } else {
    return handle(req, res)
    // }
  })

  server.listen(port, err => {
    if (err) throw err
    console.log(`Listening on http://localhost:${port}`)
  })
})

const getSlug = (page, subPage = null) => {
  if (subPage) {
    page = `${page}/${subPage}`
  }
  switch (page) {
    case 'getstarted':
      return 0
    case 'preferences/gender':
      return 5
    case 'gender':
      return 1
    case 'preferences/age':
      return 6
    case 'age':
      return 2
    case 'location':
      return 3
    case 'images':
      return 4
    case 'about':
      return 7
    case 'interests':
      return 8
    case 'goPro':
      return 9
  }
}