How to change listening port from 80 to arbitrary?

Question

Domain Name System

Greetings! I have such a situation, there is a server running on node.js and you need to connect 2 domains to it, and therefore you need to listen on different ports or is it organized somehow differently? Tell me please.

Answer 1

and you need to connect 2 domains to it, and therefore wiretapping needs to be done on different ports, or is it organized somehow differently

Somehow differently.
Stupid wrong decision: depending on the domain, just serve different content.
The right solution: nginx, which your applications will run behind.

Answer 2

Check the req.url field, parse it, take a domain name from it, and you can make at least 100 sites on one port. Or reverse proxy on several ports: nginx, haproxy.