Flutter - Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>

flutter dart dart-http

474

Change this for mapping response to your model class

var responseData = StoreData.fromJson(response.data);

474

Author by

Achin

#SOreadytohelp

Updated on December 13, 2022

Comments

Achin over 1 year
I am calling a post API, in which I have to send FormData but after receiving the response when I try to parse that response I am getting below exception.
```
static Future<String> versionApiRequest(String storeId, String deviceId) async {
    String versionApi = 'https://xxxxxxx/${storeId}/api_v5/version';
    print('$versionApi , $storeId');

    FormData formData = new FormData.from(
        {"device_id": deviceId, "device_token":"", "platform":"android"});
    Dio dio = new Dio();
    Response response = await dio.post(versionApi, data: formData,
        options: new Options(
        contentType: ContentType.parse("application/json")));
    print(response.data.toString());

    StoreData storeData = storeDataFromJson(response.data);
    //print("-------store.success ---${storeData.success}");
    return "";
  }
```
i am getting below error:
```
Unhandled Exception: type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'String'
    #0      ApiController.versionApiRequest (package:restroapp/src/networkhandler/ApiController.dart:43:54)
    <asynchronous suspension>
```
below is my Model class https://gist.github.com/achinverma/641774f50d27b2f4f5be9f1c341f0fc2
- Sharad Paghadal almost 5 years
  
  As you know that the response is in map for it can not be directly converted to string as you wrote this print(response.data.toString()); Try to map it in object first and then print that object.
- Achin almost 5 years
  
  ok, let me try this fix
- Sharad Paghadal almost 5 years
  
  White printing object, put toJson();
- Achin almost 5 years
  
  @SharadPaghadal, i got Unhandled Exception: FormatException: Unexpected character (at character 2) after doing response.data.toString()
- Sharad Paghadal almost 5 years
  
  instead of managing class json method at your own, you can use this - flutter.dev/docs/development/data-and-backend/…
- Achin almost 5 years
  
  i am using dio: 2.1.13 lib to send formData in API, but my json is validated in json lint, i don't know why i am getting this error
- Achin almost 5 years
  
  Let us continue this discussion in chat.