How can I define a variable like JSON object in Flutter?

Question

What I am trying to do is creating a variable that can hold the following data:

questiion = { 'title': '',
            'description': '',
            'questionTitle': '',
            'option1Text': '',
            'option2Text': '',
            'option3Text': '',
            'option1Correctness': false,
            'option2Correctness': false,
            'option3Correctness': false,
            'questionNumber' : 1 }

Then I can get these values from forms and save the users input data into them like following:

          onSaved: (value) {
            question['title'] = value!;
          },

I don't know if there is any data type in flutter for doing that? I know there is Map<> but it can only consist 1 pair of key:value. Maybe I should create a nested Map? Or there is a better way?

This questions variable is already a Map<String, dynamic> and can do what it is you're asking. A Map can take very many pair values. — DARTender
– DARTender, Commented Mar 4, 2023 at 18:54
@DARTender: Yeah, I didn't know a dynamic variable can hold a JSON string. — best_of_man
– best_of_man, Commented Mar 4, 2023 at 19:02

diegoveloper · Accepted Answer · 2023-03-04 19:38:05Z

5

Using Map<String,dynamic> should be right way (if you don't want to create a class).

Like this:


    final question = <String, dynamic>{
      'title': '',
      'description': '',
      'questionTitle': '',
      'option1Text': '',
      'option2Text': '',
      'option3Text': '',
      'option1Correctness': false,
      'option2Correctness': false,
      'option3Correctness': false,
      'questionNumber': 1
    };

    print(question);

The print will give you this output:

{title: , description: , questionTitle: , option1Text: , option2Text: , option3Text: , option1Correctness: false, option2Correctness: false, option3Correctness: false, questionNumber: 1}

answered Mar 4, 2023 at 19:38

diegoveloper

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sigmapie8 · Accepted Answer · 2023-03-04 18:40:03Z

0

Yes, you can go for a nested key-value map, or you can also keep everything in an object.

This ans might help you: Json parsing in dart (flutter)

answered Mar 4, 2023 at 18:40

sigmapie8

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