I have a problem with my dart object. First I recieve data from my http api, which is a json, than I use the jsonDecode function and than I try to work with it, but it seems to be impossible.

This is the json:

[{car_name: virtual_vehicle, company_name: company1}, {car_name: virtual_vehicle_2, company_name: company2}, {car_name: virtual_vehicle_3, company_name: company3}]

This is the fetch function:

Future<List?> availableCars({
    bool? wait,
    int? since,
  }) async {
    final response = await availableCarsWithHttpInfo(
      wait: wait,
      since: since,
    );
    if (response.statusCode >= HttpStatus.badRequest) {
      throw ApiException(response.statusCode, await _decodeBodyBytes(response));
    }
    // When a remote server returns no body with a status of 204, we shall not decode it.
    // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
    // FormatException when trying to decode an empty string.
    if (response.body.isNotEmpty &&
        response.statusCode != HttpStatus.noContent) {
      final responseBody = await _decodeBodyBytes(response);
      //return (await apiClient.deserializeAsync(responseBody, 'List<Car>') as List).cast<Car>().toList(growable: false);
      return jsonDecode(responseBody);
    }
    return null;
  }

And this is the function where i try to format the data from the api fetch:

Future<void> fetchCarsandCompanies() async {
  var apiInstance = CarApi(globals.apiClient);
  try {
    var cars = await apiInstance.availableCars();
    print(cars);

    if (cars != Null) {
      globals.carList = cars;
      globals.companyList = cars?.map((car) => car['companyName']);
    }
  } catch (error) {
    print('Fetch cars and companies error: $error');
  }
}

If anybody would have any idea why it does not work, please let me know. Thank you.