How to get the host URL using JavaScript from the current page

Given that I'm on the following page:

http://www.webmail.com/pages/home.aspx

How can I retrieve the host name ("http://www.webmail.com") with JavaScript?

// will return the host name and port
var host = window.location.host; 

or possibly

var host = window.location.protocol + "//" + window.location.host;

or if you like concatenation

var protocol = location.protocol;
var slashes = protocol.concat("//");
var host = slashes.concat(window.location.host);

// or as you probably should do
var host = location.protocol.concat("//").concat(window.location.host);

// the above is the same as origin, e.g. "https://stackoverflow.com"
var host = window.location.origin;

If you have or expect custom ports use window.location.host instead of window.location.hostname

To get the hostname: location.hostname

But your example is looking for the scheme as well, so location.origin appears to do what you want in Chrome, but gets not mention in the Mozdev docs. You can construct it with

location.protocol + '//' + location.hostname

If you want the port number as well (for when it isn't 80) then:

location.protocol + '//' + location.host

You can get the protocol, host, and port using this:

window.location.origin

Browser compatibility

Desktop

Mobile

All browser compatibility is from Mozilla Developer Network

let path = window.location.protocol + '//' + window.location.hostname + ':' + window.location.port;