DIO response decode issue

Question

I am using Dio for making the HTTP request

  var dio = Dio();
    var response =
        await dio.get(URL);
    final responseBody = json.decode(response.data);

    final statusCode = response.statusCode;

    if (statusCode != 200 || responseBody == null) {
      print("status code:$statusCode");
      throw new ServerExceptionHandler(
          "An error ocurred : [Status Code : $statusCode]", statusCode);
    }

A response I am paring

{
"x_id": "home"
}

but json.decode(response.data) is throwing the exception.

type '_InternalLinkedHashMap<String, dynamic>' is not a subtype of type 'String'

The Strange thing is when I replace Dio with http.get(url) then json.decode(response.body) works perfectly with same response

Answer 1

Your response data is already a Map so you could simply do that:

var response = await dio.get(_url);
var responseBody = response.data;
print(responseBody);

This is with explicit types:

Response<Map> response = await dio.get(_url);
Map responseBody = response.data;
print(responseBody);

Answer 2

Follow this approach Take the response as String. Now you can decode it...

 Response<String> response = await DioUtils.getInstance().get(JSON_API);
 List responseJson = json.decode(response.data);
 return responseJson.map((m) => new User.fromJson(m)).toList();