How to use nested maps in Dart? - dart

Question

I am trying to use Dart alongside a api for a school system i have reverse engineered and I'm trying to implement it in a library, when using dio to send a request it is converted to a map (the output of the api is json i think) but it is nested and I’m not sure on how to work with them.
This is the code i have written
class StudentClient{
String sessionID;
StudentClient(this.sessionID);
Future<Map> basicInfo() async {
var dio = Dio();
dio.options.headers["Authorization"] = "Basic $sessionID";
Response loginRequest = await dio.get(
'https://www.classcharts.com/apiv2student/ping',
options: Options(contentType: Headers.formUrlEncodedContentType),
);
assert(loginRequest.data is Map);
Map<dynamic, dynamic> request = loginRequest.data;
return request;
}
and the (censored) output
{success: 1, data: {user: {id: 696969, name: Foo Bar, first_name: Foo, last_name: Bar, avatar_url: https://asdsdsdsd/26.0.0/img/faces/default.png, display_behaviour: true, display_parent_behaviour: false, display_homework: true, display_rewards: true, display_detentions: true, display_report_cards: true, display_classes: false, display_announcements: true, display_attendance: false, display_attendance_type: none, display_attendance_percentage: true, display_activity: true, display_mental_health: false, display_mental_health_no_tracker: false, display_timetable: true, is_disabled: false, display_two_way_communications: true, display_absences: false, can_upload_attachments: false, display_event_badges: false, display_avatars: false, display_concern_submission: false, display_custom_fields: false, pupil_concerns_help_text: , allow_pupils_add_timetable_notes: false, detention_alias_plural_uc: Detentions, announcements_count: 0, messages_count: 0, pusher_channel_name: Pupil_dfghfghhghfghfghfghfghfghfghfghfghfgh, has_birthday: true, has_new_survey: false, survey_id: null}}, meta: {version: 26.0.0}}
Any help would be appreciated!