<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def to_json(self, filename=None, encoding="utf-8", errors="strict", **json_kwargs):
 """ Transform the Box object into a JSON string. :param filename: If provided will save to file :param encoding: File encoding :param errors: How to handle encoding errors :param json_kwargs: additional arguments to pass to json.dump(s) :return: string of JSON or return of `json.dump` """

        return _to_json(self.to_dict(), filename=filename,
                        encoding=encoding, errors=errors, **json_kwargs)