Simple ajax in laravel 4

i have following code

ajax

 //ajax edit button
 $('.edit_button').on('click', function(e) {
    var id_produk = $(this).attr('id');
    $.ajax({
        type : "POST",
        url : "editproduk",
        data : id_produk,
        dataType: 'JSON',
        success : function(data) {
           alert('Success');
           console.log(data);
        },
        error: alert('Errors')
    });
});

i always get messagebox error
and don't know where i'm missing,
because in chrome - inspect element - console not give any clue

my route

Route::post('/account/editproduk', array(
    'as' => 'edit-produk-post',
    'uses' => 'AccountController@postEditProduk'
));

my controller

public function postEditProduk() {
    if (Request::ajax()) {
        return "test test";
    }
}