How to enable SSL/TLS for Express.js application

For node.js applications, you can enable SSL on the application side or using Nginx or Apache running as a reverse proxy. To enable SSL for a node.js express application, use the following code.

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

var port = 3000;

var options = {
    key: fs.readFileSync('./ssl/ssl.key'),
    cert: fs.readFileSync('./ssl/ssl.crt'),
};

var app = express();

var server = https.createServer(options, app).listen(port, function(){
  console.log("Express server listening on port " + port);
});

app.get('/', function (req, res) {
    res.writeHead(200);
    res.end("hello world\n");
});

See node.js