https_express-intro.js

//server.js

const express = require('express'),
	  https = require('https'),
	  http = require('http'),
	  fs = require('fs'),
	  app = express();

//credentials obtained from a Certificate Authority
var options = {
  key: fs.readFileSync('/path/to/key.pem'),
  cert: fs.readFileSync('/path/to/cert.pem')
};

//Binding the app on different ports so the app can be assessed bt HTTP and HTTPS
http.createServer(app).listen(80);
https.createServer(options, app).listen(443);