HTTPS on localhost using NextJS + Express

You just need to use the createServer method of https module.

const { createServer } = require('https');const { parse } = require('url');const { readFileSync } = require('fs');const next = require('next');const port = 3000;const dev = process.env.NODE_ENV !== 'production';const app = next({ dev });const handle = app.getRequestHandler();const httpsOptions = {  key: readFileSync('./certificates/key.pem'),  cert: readFileSync('./certificates/cert.pem')};app.prepare()  .then(() => {    createServer(httpsOptions, (req, res) => {      const parsedUrl = parse(req.url, true);      handle(req, res, parsedUrl);    }).listen(port, err => {      if (err) throw err;      console.log(`> Ready on https://localhost:${port}`);    })  });

Other answer seemed to just drop express... Found a solution after some difficulty with both server code and certificate so hopefully can save someone else the trouble!

First of all, solid advice for creating localhost certificate here:https://letsencrypt.org/docs/certificates-for-localhost/

Secondly, simple code that offers HTTP/HTTPS with next js and express:

const next = require('next');const express = require('express');const http = require('http');const https = require('https');const fs = require('fs');const ports = {  http: 3080,  https: 3443}const dev = process.env.NODE_ENV !== 'production';const app = next({ dev });const handle = app.getRequestHandler();const server = express();  const options = {   key: fs.readFileSync('localhost.key'),  cert: fs.readFileSync('localhost.crt'), };app.prepare().then(() => {             server.all('*', (req, res) => {    return handle(req, res)      });  http.createServer(server).listen(ports.http);  https.createServer(options, server).listen(ports.https);});

It is worth noting that one could omit or redirect either port.

Below work for me very well for next server with https;

Using this official documentation of node js https module Creating HTTPS Server

const { createServer } = require('http')const { parse } = require('url')const next = require('next')const { readFileSync } = require('fs');const port = parseInt(process.env.PORT, 10) || 3000const dev = process.env.NODE_ENV !== 'production'const app = next({ dev })const handle = app.getRequestHandler()const httpsOptions = {    pfx: readFileSync('./certificates/AMB.pfx'),    passphrase: 'Testabc$'  };app.prepare().then(() => {    createServer(httpsOptions, (req, res) => {            const parsedUrl = parse(req.url, true)        const { pathname, query } = parsedUrl        if (pathname === '/login') {            app.render(req, res, '/login', query)        } else {            handle(req, res, parsedUrl)        }    }).listen(port, err => {        if (err) throw err        console.log(`> Ready on https://localhost:${port}`)    })})