main.js

const express = require("express");
const fs = require('fs');
const app = express();
// const http = require("http").createServer(app);
const options = {
  key: fs.readFileSync("/etc/letsencrypt/live/hummingbirdapp.blue/privkey.pem"),
  cert: fs.readFileSync("/etc/letsencrypt/live/hummingbirdapp.blue/cert.pem"),
  ca: fs.readFileSync("/etc/letsencrypt/live/hummingbirdapp.blue/chain.pem"),
};
const https = require("https").createServer(options, app);

https.listen(7000, () => {});

website.com.conf

LoadModule ssl_module libexec/apache2/mod_ssl.so
<VirtualHost *:443>
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        ServerName www.hummingbirdapp.blue
        SSLEngine on
        SSLCertificateFile "/etc/letsencrypt/live/hummingbirdapp.blue/cert.pem"
        SSLCertificateKeyFile "/etc/letsencrypt/live/hummingbirdapp.blue/privkey.pem"
        SSLCertificateChainFile "/etc/letsencrypt/live/hummingbirdapp.blue/chain.pem"
        ServerName hummingbirdapp.blue
        ServerAlias www.hummingbirdapp.blue
        # DocumentRoot /var/www/website.com/public_html
        ProxyPass / http://localhost:7000/
        ProxyPassReverse / http://localhost:7000/
        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf

</VirtualHost>