How to Efficiently Extract Hostname from a String in JavaScript?

Extract Hostname Name from String: JS/jQuery Method

For extracting hostname names from URLs, traditional regular expressions can prove slow. Here's a more efficient alternative:

Solution:

Leverage the HTML5 API by creating an anchor element:

var tmp = document.createElement('a');
tmp.href = "http://www.example.com/12xy45";

This sets the hostname property to the root domain, such as 'www.example.com'. For the full hostname and port, use the host property instead.

Example Function:

Wrap this solution in a reusable function:

function url_domain(data) {
  var a = document.createElement('a');
  a.href = data;
  return a.hostname;
}

Now you can easily extract the hostname from any URL:

console.log(url_domain("http://www.youtube.com/watch?v=ClkQA2Lb_iE")); // "www.youtube.com"
console.log(url_domain("http://www.example.com/12xy45")); // "www.example.com"

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