how can I use data posted from ajax in flask?

I'm having trouble getting data POSTed from jquery ajax. $('#clickme').click( function() { var data = save_input(); // data data['_sid'] = $survey_id; // survey_id injected from flask data['_uip'] = $user_ip; // user_ip injected from flask, request.remote_addr $.ajax({ type : "POST", url : "{{ url_for('mod.load_ajax') }}", data: JSON.stringify(data), contentType: 'application/json;charset=UTF-8',