tld-parse

tldextract accurately separates a URL's subdomain, domain, and public suffix, using the Public Suffix List (PSL).

Say you want just the "google" part of https://www.google.com. Everybody gets this wrong. Splitting on the "." and taking the 2nd-to-last element only works for simple domains, e.g. .com. Consider http://forums.bbc.co.uk: the naive splitting method will give you "co" as the domain, instead of "bbc". Rather than juggle TLDs, gTLDs, or ccTLDs yourself, tldextract extracts the currently living public suffixes according to the Public Suffix List.

A "public suffix" is one under which Internet users can directly register names.

A public suffix is also sometimes called an effective TLD (eTLD).

Install

# Regular install
npm install --save tld-parse

# You can update the list of well-known TLD during the install
npm install --save tld-parse --tld-update-rules

The latter is useful if you significantly rely on an up-to-date list of TLDs. You can [list the recent changes][] ([changes Atom Feed][]) to get a better idea of what is going on in the Public Suffix world.

Usage

import factory from '../dist/bundle.js';

const extract = factory('www.google.com');

// { domain: 'google',
//   isPrivate: false,
//   subdomain: 'www',
//   suffix: 'com',
// }

FAQ

Can you add suffix ____? Can you make an exception for domain ____?

This project doesn't contain an actual list of public suffixes. That comes from the Public Suffix List (PSL). Submit amendments there.

In the meantime, you can tell tldextract about your exception by either forking the PSL and using your fork in the suffix_list_urls param, or adding your suffix piecemeal with the extra_suffixes param.

I see my suffix in the Public Suffix List (PSL), but this library doesn't extract it.

Check if your suffix is in the private section of the list. See this documentation.