After extensive search over internet i am sure that Prestashop does not return data in JSON format, it only returns in XML format (which leads to cross domain accessing issue un
I don't know about historical support for this, but...
In the latest version of Prestashop (currently v1.6.0.9), you can get a JSON response from any WebService API request by appending output_format=JSON
to your request query string.
E.g.
http://example.prestashop.com/api/products?output_format=JSON