Browsers default to port 80 for HTTP and 443 for HTTPS, changing your server's port (whether it's Node.js or something else) to port 80 should do the trick.
You can use apache, nginx, haproxy, or the like and reverse proxy from [IP ADDRESS] -> [INTERNAL IP]:3000 (With Internal IP being locally - 127.0.0.1). You can also change the port of your app to make it use 80 so when someone enters the IP (or domain if its an A record) it will go to the web page of your app without having to define the port within the URL
Thanks darius, is this tutorial a good guide for that https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-14-04?
So would I need to do something like this? https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-14-04
Yes, that would work very well for what you are trying to do. I would recommend using nginx or haproxy over apache too.
