Quick local HTTPS server (Node.js)

server.js

const { spawnSync } = require('child_process')
const { createReadStream, existsSync, readFileSync } = require('fs')
const { access } = require('fs/promises')
const https = require('https')

const conf = {
	default: 'index.html',
	log: {
		access: false,
		error: true },
	mime: {
		'css': 'text/css',
		'html': 'text/html',
		'jpe?g': 'image/jpeg',
		'js': 'text/javascript',
		'png': 'image/png' }, // add as needed
	port: 3000,
	// src: './public' // optional
}

const contentType = path => {
	let s = 'text/plain'
	const m = path.match(/\.([^./?]+)(\?|$)/)
	if (!m) return s
	const [_, ext] = m
	for (const [k, v] of Object.entries(conf.mime))
		if (ext.match(new RegExp(k))) return v
	return s
}

const crt = 'server.crt'
const key = 'server.key'
if (!(existsSync(crt) && existsSync(key)))
	spawnSync('openssl', `req -x509 -out ${crt} -keyout ${key} -newkey rsa:2048 -nodes -sha256 -subj /CN=localhost`.split(' '))

https
	.createServer(
		{ cert: readFileSync(crt), key: readFileSync(key) },
		async (req, res) => {
			const path = `${conf.src || __dirname}${req.url}${req.url === '/' ? conf.default : ''}`
			try {
				await access(path)
				conf.log.access && console.log(`200 ${req.url}`)
				res.writeHead(200, { 'content-type': contentType(path) })
				createReadStream(path).pipe(res)
			} catch (e) {
				conf.log.error && console.error(`404 ${req.url} ${e.message}`)
				res.writeHead(404)
				res.end()
			}
		})
	.listen(conf.port)

console.log(`Ready. https://localhost${conf.port === 80 ? '' : ':' + conf.port}`)