code: def _write_json(filepath, data, kwargs):
      
      with io_stl.open(filepath, 'w', encoding='utf8') as outfile:
          if 'indent' not in kwargs:
              kwargs['indent'] = 4
          if 'sort_keys' not in kwargs:
              kwargs['sort_keys'] = True
          if 'separators' not in kwargs:
              kwargs['separators'] = (',', ': ')
          if 'ensure_ascii' not in kwargs:
              kwargs['ensure_ascii'] = False
          str_ = json.dumps(data, **kwargs)
          outfile.write(to_unicode(str_))
      return data
docs: See documentation of mpu.io.write.