AJASON is a PHP 5 library and JavaScript client for the Web technology called AJAX. AJAX permits data to be fetched asynchronously without the need for reloading the Web page and thus allows the development of interactive GUI-like Web applications. JSON is a lightweight data interchange format which is used by AJASON to exchange data between server and client. AJASON features the ability to exchange complex data types and client-side error reporting for server-side AJASON errors.