langchain/document_loaders/joplin.py/JoplinLoader/_get_folder
class JoplinLoader:    def _get_folder(self, folder_id: str) -> str:
        req_folder = urllib.request.Request(self._get_folder_url.format(id=folder_id))
        with urllib.request.urlopen(req_folder) as response:
            json_data = json.loads(response.read().decode())
            return json_data["title"]