def parse(self, text, layers=None):
        """Parsing passed text to json.

        Args:
            text: Text to parse.
            layers (optional): Special fields. Only one string
                or iterable object (e.g "Data", ("Data", "Fio")).
                Only these fields will be returned.


        Returns:
            The parsed text into a json object.
        """
        params = {
            "text": text,
            "key": self.key,
        }

        if layers is not None:
            # if it's string
            if isinstance(layers, six.string_types):
                params["layers"] = layers

            # if it's another iterable object
            elif isinstance(layers, collections.Iterable):
                params["layers"] = ",".join(layers)

        req = requests.get(self.NLU_URL, params=params)
        return req.json()