passing json array to jquery

Hi , I try to read through the ARRAY jQuery I was taking through JSON , but the response is " undefined" . How can I pass an array from routes to JQ ? The idea is to return the names of the images that arose through the array . Here's the code :

Route::post('upimage', function(){

        $i = rand();


    foreach (Input::file("image") as $image) {

    $imagename = time(). $image->getClientOriginalName();


    $upload = $image->move(public_path() . "/img/",$imagename);

    $img_id = DB::table('images')->insert(
    array('name' => $imagename, 'author' => '0')
);


      if ($upload) {


        $images [] = $imagename;


    }

        return Response::json($images);




});
}

jquery:

 $("form#data").submit(function(event){

        event.preventDefault();

          var formData = new FormData($(this)[0]);

        $.ajax({
            url: "upimage",
            type: "POST",
            data: formData,
           success: function(data) { 

          $.each( data, function( key, value ) {
  alert( key[ + ": " + value] );
      });


           }, 

            cache: false,
            contentType: false,
            processData: false
        });

    });