Redirect http to https with Node.js - node.js

Question

I have a Node.js server, with an active SSL certificate on the domain.
I have read some replies on this website about this, yet even when I relate to such already-solved questions, I get an error.
var express = require('express');
var https = require('https');
var http = require('http');
var path = require('path');
var fs = require('fs');
var mysql = require('mysql');
var queue = {};
var qc = {};
var app = express();
var options = {
key: fs.readFileSync('sslcert/domain-name.key', 'utf8'),
cert: fs.readFileSync('sslcert/domain-name.csr', 'utf8')
};
var httpServer = http.createServer(app);
var httpsServer = https.createServer(options, app);
/* various stuff to display my website */
httpServer.listen(process.env.PORT);
httpsServer.listen(process.env.PORT);
I get the following error in my console.
_tls_common.js:67
c.context.setCert(options.cert);
^
Error: error:0906D06C:PEM routines:PEM_read_bio:no start line
at Error (native)
at Object.createSecureContext (_tls_common.js:67:17)
at Server (_tls_wrap.js:754:25)
at new Server (https.js:17:14)
at Object.exports.createServer (https.js:37:10)
at Object.<anonymous> (/srv/data/web/vhosts/default/server.js:35:25)
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)
Thank you in advance for your answer!
Noël.

Answer 1

cert should be your domain's PEM formatted certificate, followed by the PEM formatted intermediate certificates; not the CSR.
cert: fs.readFileSync('sslcert/domain-name.pem', 'utf8')

Answer 2

In addition to the answer by Anand Bhat note that you shouldn't bind both of those servers to the same port like you're trying to do:
httpServer.listen(process.env.PORT);
httpsServer.listen(process.env.PORT);
It might work but it might work not how you expect it. If you do:
httpServer.listen(process.env.PORT_HTTP);
httpsServer.listen(process.env.PORT_HTTPS);
where PORT_HTTP is e.g. 80 and PORT_HTTPS is e.g. 443, you will always know which server will process which request.