javascript get domain

var url = window.location.href;
var domain = url.replace('http://','').replace('https://','').split(/[/?#]/)[0];

const url = 'https://www.mydomain.com/blog?search=hello&world';
const domain = (new URL(url)).hostname.replace('www.','');

window.location.hostname

const url = 'http://www.youtube.com/watch?v=ClkQA2Lb_iE';
const { hostname } = new URL(url);

console.assert(hostname === 'www.youtube.com'); // true