code: def load_json_file(json_file):
      
      with io.open(json_file, encoding='utf-8') as data_file:
          try:
              json_content = json.load(data_file)
          except exceptions.JSONDecodeError:
              err_msg = u"JSONDecodeError: JSON file format error: {}".format(json_file)
              logger.log_error(err_msg)
              raise exceptions.FileFormatError(err_msg)
  
          _check_format(json_file, json_content)
          return json_content
docs: load json file and check file content format