Convert JSON data to List<Map<String, dynamic>>

Question

I am facing a problem in flutter for converting JSON data as List<Map<String, dynamic>>.

rawJson =
        '[{"value":"1","label":"red"}, {"value":"2","label":"Green"}, {"value":"3","label":"Yellow"}]';

This data need to convert as List<Map<String, dynamic>>

The following code is working, but need help top things.

List<Map<String, dynamic>> _items = [
    {
      'value': '1',
      'label': 'Red',
    },
    {
      'value': '2',
      'label': 'Green',
    },
    {
      'value': '3',
      'label': 'Yellow',
    },
  ];

i don't understand about you't question, you'r code work fine. what do you want ? — mohammad mobasher
– mohammad mobasher, Commented Sep 3, 2021 at 16:41

CopsOnRoad · Accepted Answer · 2021-09-03 17:08:07Z

4

You need to cast your json like this:

var rawJson = '[{"value":"1","label":"red"}, {"value":"2","label":"Green"}, {"value":"3","label":"Yellow"}]';

List<Map<String, dynamic>> output = (json.decode(rawJson) as List).cast();
// or
List<Map<String, dynamic>> output = List.from(json.decode(rawJson) as List);

answered Sep 3, 2021 at 17:08

CopsOnRoad

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Comments

jnk.sch · Accepted Answer · 2021-09-03 17:03:12Z

0

This is probably what your are looking for:

  var rawJson =
      '[{"value":"1","label":"red"}, {"value":"2","label":"Green"}, {"value":"3","label":"Yellow"}]';

  var iterableResult = (jsonDecode(rawJson) as List<dynamic>).map((element) =>
      {"value": int.parse(element['value']), "label": element['label']});
  var listResult = iterableResult.toList();
  print(listResult); // prints [{value: 1, label: red}, {value: 2, label: Green}, {value: 3, label: Yellow}]

answered Sep 3, 2021 at 17:03

jnk.sch

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