How to read vimeo API response?

Question

I am playing around with Vimeo APIs. I fetch all folders(projects) using

$options= array();    
$response = $client->request('/me/folders?page=2&perPage=3', $options, 'GET');

It returns a reponse, 'https://pastebin.com/WnjyX72D' which is not recognizable by any json formatting tool. What am I doing wrong?