CODEWITHSUNDEEP
jsonflutterdartfromjson
John Joe
John Joe

Reputation: 12803

Get object in json flutter

I have this JSON output (using Chopper library)

{"status":"success","error_message":[],"abc":[{"id":"124"},{"id":"125"}]}

How can I get the id in object abc ?

Response response = await _repo.submitData(title, description);

var abcResponse = ABCResponse.fromJson(response.body);
    if (abcResponse.status == 'success') {
       // I want print the latest id
  }
}

ABCResponse

part 'abc_response.g.dart';

    @JsonSerializable()
    class ABCResponse extends BaseResponse {
      var abc = new List<ABC>();
      ABCResponse();

      factory ABCResponse.fromJson(Map<String, dynamic> json) =>
          _$ABCResponse(json);
      Map<String, dynamic> toJason() => _$WABCResponseToJson(this);
    }

ABC

 @JsonSerializable()
class ABC {

  ABC();
  var id;
}

Edit

 Response response = await _repository.submitData(title, description);

    var abcResponse = ABCResponse.fromJson(response.body);
    if (abcResponse.status == 'success') {
      var user = json.decode(abcResponse.abc.toString());
      print(user);   // it printing null value
    }

Upvotes: 0

Views: 195

Answers (1)

FutureJJ
FutureJJ

Reputation: 2688

Here is an example code to decode the given json and extract id.

import 'dart:convert';

void main() 
{
  var jsonString = '{"status":"success","error_message":[],"abc":[{"id":"124"},{"id":"125"}]}'; // just store input json to a variable.
  var user = json.decode(jsonString.toString()); // convert input to string if it isn't already
  print(user['abc'][0]['id']); // complex(nested) json parsing; prints 124
}

use json.decode() to convert json string to a Map.

  1. user['abc'] will give you [{id: 124}, {id: 125}]
  2. user['abc'][0] will give you {id: 124}, {id: 125} i.e. extract 0th element of the input List.
  3. Finally ['abc'][0]['id'] will give you the id: 124.

Upvotes: 1

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