stevenvachon / strip-www

Remove a leading "www" subdomain from a hostname.

strip-www

Remove a leading "www" subdomain from a hostname.

Note: this library uses a rather complex algorithm for parsing hostnames, which can result in bundled file sizes that are larger than you might expect. If all you want is a simple RegExp, use a 1.x release; but first read about its edge cases.

Installation

Node.js >= 14 is required. To install, type this at the command line:

npm install strip-www

Usage

const stripWWW = require('strip-www');

stripWWW('www.domain.com');     //-> domain.com
stripWWW('www.www.domain.com'); //-> www.domain.com
stripWWW('www.unlisted-tld');   //-> www.unlisted-tld

The hostname must be Punycode encoded, as provided by a URL:

stripWWW('www.ᄯᄯᄯ.com');
//-> 'www.ᄯᄯᄯ.com'

const url = new URL('http://www.ᄯᄯᄯ.com');
stripWWW(url.hostname);
//-> 'xn--brdaa.com'

If necessary, you can decode after with punycode:

const { toUnicode } = require('punycode');

console.log(toUnicode('xn--brdaa.com'));
//-> 'ᄯᄯᄯ.com'