Question

Say that I have a domain subdomain.domain.com, when I check the document.domain I’m getting the result subdomain.domain.com, what can I do to get only the original domain without the sub domain, for example: domain.com

Answer 1

This will work for a .com domain in the example you specified, you would have to adjust the slice for .co.uk, .com.au and some other TLDs:

document.domain.split(".").slice(-2).join(".");