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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

udidu
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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(".");
Andy E
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  • Thanks but I don't know what will be the domain, I need something more generic. – udidu Apr 18 '12 at 13:14
  • @UdiTalias: can you guarantee that it will only be `subdomain.domain.tld` or can it be `subdomain.subdomain.domain.tld`? – Matt Apr 18 '12 at 13:16
  • It can be also subdomain.subdomain.domain.tld. Actually I don't know what will be the domain, it can be anything... – udidu Apr 18 '12 at 13:17
  • @Udi: then you're going to struggle because the only way to do it is to have an up-to-date list of all TLDs (keeping note of which have CCSLDs), and continuing to maintain it as new ones are introduced. – Andy E Apr 18 '12 at 13:29
  • @Udi: see [this related question](http://stackoverflow.com/questions/399250/going-where-php-parse-url-doesnt-parsing-only-the-domain) looking for a similar solution in PHP for more information. – Andy E Apr 18 '12 at 13:34
  • Posting this for [Yanislav Tankov](http://stackoverflow.com/users/6640908/yanislav-tankov): `document.domain.split(".").slice(-2).join(".");` works for me for all domains .com, .co.uk, sub.domain.co.uk domain.co... etc. BUT not for male.domain.co.uk – NathanOliver Jul 26 '16 at 16:45