code: def save_json_representation(self, dir_path):
          
          file_name = self.__class__.__name__+ '.json'
          file_path = os.path.join(dir_path, file_name)
          with open(file_path, 'w') as outfile:
              json.dump(self.get_json_representation(), outfile)
docs: Save the app's JSON representation object to a JSON file.