// Dependencies
const fs = require('fs');
const http = require('http');
const https = require('https');
const express = require('express');

const app = express();

// Certificate
const privateKey = fs.readFileSync('/etc/letsencrypt/live/mi-dominio.com/privkey.pem', 'utf8');
const certificate = fs.readFileSync('/etc/letsencrypt/live/mi-dominio.com/cert.pem', 'utf8');
const ca = fs.readFileSync('/etc/letsencrypt/live/mi-dominio.com/chain.pem', 'utf8');

const credentials = {
    key: privateKey,
    cert: certificate,
    ca: ca
};

app.use((req, res) => {
    res.send('Hello there !');
});

// Starting both http & https servers
const httpServer = http.createServer(app);
const httpsServer = https.createServer(credentials, app);

httpServer.listen(80, () => {
    console.log('HTTP Server running on port 80');
});

httpsServer.listen(443, () => {
    console.log('HTTPS Server running on port 443');
});

events.js:141
      throw er; // Unhandled 'error' event
      ^

Error: listen EACCES 0.0.0.0:80
    at Object.exports._errnoException (util.js:870:11)
    at exports._exceptionWithHostPort (util.js:893:20)
    at Server._listen2 (net.js:1221:19)
    at listen (net.js:1270:10)
    at Server.listen (net.js:1366:5)
    at Object.<anonymous> (/home/ec2-user/index.js:28:12)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)