<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def stringify(req, resp):
 """ dumps all valid jsons This is the latest after hook """

    if isinstance(resp.body, dict):
        try:
            resp.body = json.dumps(resp.body)
        except(nameError):
            resp.status = falcon.HTTP_500