Laravel ajax form 422 Unprocessable Entity

I am trying to validate and submit a form from a site made with Laravel 5.2 The problem comes, when i try to submit the form without filling all required fields. The StoreRequest checks which fields are required and returns me the errors like that:

{"name":["The name field is required."],"email":["The email field is required."],"subject":["The subject field is required."],"content":["The content field is required."]}

Here is how i submit the form and how i want to display the errors of the validation:

$("#contact_form").submit(function() {
        $.post("", {"_token": "" },
        function(data) {
            if(data) {
                var items = [];
                $.each( data, function( key, val ) {
                    items.push( "<li id='" + key + "'>" + val + "</li>" );
                });

                $( "<ul/>", {
                    "class": "my-new-list",
                    html: items.join( "" )
                }).appendTo("#errors");
            }
        });
        return false;
    });

via Chebli Mohamed