Do I change app.listen('port number') when I finally publish my website to a hostserver? - node.js

Question

This is my first time publishing a website so excuse me if my question sounds dumb or easy. So I finally finished the frontend and backend of my website and I'm going to publish it to a hostname from namecheap.com. I'm using express and an abstract example of how my backend looks would be like this:
const express = require("express");
const app = express();
const path = require('path');
app.use(express.static("./public"));
app.listen(5000, () => {
"server is listening!!"
})
I realize that using app.listen(5000, () => {}) is due to listening to a port in the local host. So how do I change it to finally publish it and for my hostserver to recognize it.

Answer 1

use nginx or apache upstream ,
apache and nginx as ssl termination , more secure and if you add caching you could handle more request per second
nginx config :
server {
#listen 80 ;
#listen [::]:80 ;
listen 443 ssl ;
server_name namecheap.com;
ssl_certificate /etc/nginx/ssl/domain-crt.txt;
ssl_certificate_key /etc/nginx/ssl/domain-key.txt;
ssl_session_cache shared:SSL:1m; # holds approx 4000 sessions
ssl_session_timeout 1h; # 1 hour during which sessions can be re-used.
ssl_session_tickets off;
ssl_protocols TLSv1.2 TLSv1.3;
ssl_buffer_size 4k;
location / {
proxy_set_header X-Forwarded-For $remote_addr;
proxy_pass http://localhost:5000;
proxy_buffering on;
}
}

Answer 2

If you are gonna host the website you might wanna add a port variable and assign the following value to it.
const PORT = process.env.PORT || 5000;
When you are on localhost testing the website the port variable will use the
5000
value otherwise when hosting the hosting service provides its own port to run the server which is the
process.env.PORT
make sure "PORT" is all caps. Then for running the server-
app.listen(PORT, '0.0.0.0', () => {
console.log(`Server Started at Port ${PORT}`)
});
That should do it!