docs: def _json_min(src, dest=''):
      """Minify JSON
  
      Args:
          src: json string or path-to-file with text to minify (mandatory)
          dest: path-to-file to save minified xml string; (optional)
                - if file doesn't exist it is created automatically;
                - if this arg is skept function returns string
  
      Returns: 1) minified JSON string if dest is not provided
               2) length of saved file if dest is provided
  
      Example:
              json.min('path/to/file.json')
              json.min('path/to/file.json', 'path/to/save/result.json')
      """
  
      if dest == '':
          return _json_min_exec(_text(src)) # returns string
      else:
          if type(dest) is bool:  # dest is skept, custom pattern provided at dist place
              return _json_min_exec(_text(src), dest)
          else:
              with open(dest, 'w') as f2:
                  return f2.write(_json_min_exec(_text(src)))