How to check with javascript if connection is local host?

Question

I want to have a check in my javascript if the page loading up is on my local machine.

The reason why I want to do that is that when I developing I like to make sure

Answer 1

An easy way to do this would be to just check the hostname against localhost or check your custom domain name against a substring, in this case ".local" urls, such as http://testsite.local

var myUrlPattern = '.local';
if (window.location.hostname === "localhost" || location.hostname === "127.0.0.1" || window.location.hostname.indexOf(myUrlPattern) >= 0) {
    alert("It's a local server!");
}