HTTPS-enabled NextJS server

server.js

// NextJS custom server with HTTPS
// Note, you must generate certificates on your own

const express = require('express')
const nextJs = require('next')
const https = require('https')
const fs = require('fs')

const APP_ENV = process.env.APP_ENV || 'development'
const port = parseInt(process.env.PORT, 10) || 3000
const app = nextJs({ dev: APP_ENV === 'development' })
const handle = app.getRequestHandler()

async function start () {
  const httpsOptions = {
    key: fs.readFileSync('./.cert/key.pem'),
    cert: fs.readFileSync('./.cert/cert.pem')
  }

  // Prepare next.js app
  await app.prepare()

  const server = express()

  server.all('*', handle)

  if (process.env.APP_ENV === 'development' && process.env.HTTPS === 'true') {
    https.createServer(
      httpsOptions,
      server
    ).listen(3000, (error) => {
      if (error) {
        console.log('error:', error)
      } else {
        console.log(`Started HTTPS server on ${process.env.APP_DOMAIN}`)
      }
    })
  } else {
    server.listen(port, '0.0.0.0', (err) => {
      if (err) throw err
      console.log(`> Ready on http://localhost:${port}`)
    })
  }
}

start()