flutter json to class

To convert JSON to a Dart class in Flutter, you can follow these steps:

  1. Define your JSON structure: Start by having a clear understanding of the JSON structure you want to convert. Identify the different fields and their types.

  2. Create a new Dart class: In your Flutter project, create a new Dart file where you'll define the class that represents the JSON structure.

  3. Add the necessary imports: Import the dart:convert package to use the jsonDecode function, which converts a JSON string into a Dart object.

  4. Define the class: Inside the Dart file, create a class with the same name as the JSON object. Define the class properties that match the JSON fields.

  5. Implement the factory constructor: Add a factory constructor that takes a Map<String, dynamic> as a parameter. Inside the constructor, assign the values of the JSON fields to the class properties.

  6. Convert JSON to class instance: To convert the JSON to an instance of the class, use the jsonDecode function to parse the JSON string into a Map<String, dynamic>. Then, pass the map to the factory constructor.

Here's an example of how the code could look:

import 'dart:convert';

class MyData {
  final String name;
  final int age;

  MyData({required this.name, required this.age});

  factory MyData.fromJson(Map<String, dynamic> json) {
    return MyData(
      name: json['name'],
      age: json['age'],

void main() {
  String jsonString = '{"name": "John Doe", "age": 30}';
  Map<String, dynamic> jsonMap = jsonDecode(jsonString);
  MyData myData = MyData.fromJson(jsonMap);

In this example, the MyData class represents a JSON object with name and age fields. The fromJson factory constructor takes a JSON map and assigns the values to the class properties. Finally, we decode the JSON string, create an instance of the MyData class, and print the values.

You can adapt this code to match your specific JSON structure and class requirements.