JSON string is showed instead of used

I recently added jQuery file upload (https://github.com/blueimp/jQuery-File-Upload) to my custom-made CMS system. Uploading images works fine, but loading the uploaded images doesn't. In fact: the JSON string appears on top of my file:

{"files":[{"name":"foto1.jpg","size":221882,"url":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\foto1.jpg","thumbUrl":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\thumb\/foto1.jpg","deleteUrl":"http:\/\/cake.optiekcardoen.be\/app\/webroot\/index.php?file=foto1.jpg","deleteType":"DELETE"},{"name":"foto2.jpg","size":184839,"url":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\foto2.jpg","thumbUrl":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\thumb\/foto2.jpg","deleteUrl":"http:\/\/cake.optiekcardoen.be\/app\/webroot\/index.php?file=foto2.jpg","deleteType":"DELETE"},{"name":"foto3 (1).jpg","size":171300,"url":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\foto3%20%281%29.jpg","thumbUrl":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\thumb\/foto3%20%281%29.jpg","deleteUrl":"http:\/\/cake.optiekcardoen.be\/app\/webroot\/index.php?file=foto3%20%281%29.jpg","deleteType":"DELETE"},{"name":"foto3.jpg","size":171300,"url":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\foto3.jpg","thumbUrl":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\thumb\/foto3.jpg","deleteUrl":"http:\/\/cake.optiekcardoen.be\/app\/webroot\/index.php?file=foto3.jpg","deleteType":"DELETE"},{"name":"foto4.jpg","size":222763,"url":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\foto4.jpg","thumbUrl":"D:\\Websites\\Optiek Cardoen\\05 - Cake\\app\\webroot\\img\\outlets\\6\\thumb\/foto4.jpg","deleteUrl":"http:\/\/cake.optiekcardoen.be\/app\/webroot\/index.php?file=foto4.jpg","deleteType":"DELETE"}]}

How can I solve this so the JSON string doesn't appear like that anymore?

Here's the controller code in OutletPhotosController.php:

public function add()
    {
        App::import('Vendor', 'CoasterCms.UploadHandler', array('file' => 'jQueryFileUpload' . DS . 'UploadHandler.php'));
       
        $options = array(
            'upload_dir' => WWW_ROOT . 'img' . DS . 'outlets' . DS . $this->request->params['named']['outlet_id'] . DS,
            'upload_url' => WWW_ROOT . 'img' . DS . 'outlets' . DS . $this->request->params['named']['outlet_id'] . DS,
            'accept_file_types' => '/\.(gif|jpe?g|png)$/i',
            'image_versions' => array(
                'thumb' => array(
                    'max_width' => 20,
                    'max_height' => 20,
                    'crop' => true
                )
            )
        );


        $upload_handler = new CustomUploadHandler($options);
}

And here's my very simple script in main.js:

<script>
$(function () {
    'use strict';


    // Initialize the jQuery File Upload widget:
    $('#fileupload').fileupload({
       
    });
});
</script>

Thanks for helping ;)

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