Trying to retrieve ajax data to a variable in jquery from an ajax call with a when call. But the data is as I understand not completed ajax data. Gives response in object form below where I can’t access the data under responseJSON.

{readyState: 1, getResponseHeader: function, getAllResponseHeaders: function, setRequestHeader: function, overrideMimeType: function, …}

//jQuery code calling the function with ajax

jQuery(document).ready(function() {
  var response = ajaxcall(); 
   console.log(response);
});

//function

function ajaxcall(){
   return $.ajax({
        url: "url",
        type: "POST",
        data: form_data,
        dataType: 'json',
        contentType: false,
        cache: false,
        processData:false,
        beforeSend : function()
        {
        },
        success: function(data)
        {
            if(data=='invalid')
            {
                alert("invalid data");
            }
            else
            {
            // success
                return data;
            }
        },
        error: function(e) 
        {
        }          
    });

}