get data value from vanilla javascript ajax request in laravel controller

I have a script which run at the top of the page to get the location of the client and in that script is also a javascipt ajax request.

 var xhr = new XMLHttpRequest();
            var data = county.short_name;
            xhr.open('POST', '/getlocation');
            xhr.setRequestHeader('X-CSRF-TOKEN', document.querySelector("meta[name='csrf-token']").getAttribute("content"));                
            xhr.onreadystatechange = function() {//Call a function when the state changes.
                if(xhr.readyState == XMLHttpRequest.DONE && xhr.status == 200) {
                   //window.location = '/home';
                }
            }
            xhr.send(data);

In controller i want to catch the value from request - but it does not work:

public function getLocation(Request $request){

        dd($request->data);
    }

What i am doing wrong? I am using laravel 5.4

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