How to decode JSON in Flutter?

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In Flutter, you can use the dart:convert library to parse JSON data. Here’s an example of how you can parse a JSON string into a Dart object:

import 'dart:convert';

String jsonString = '{"name": "John Doe", "email": "[email protected]"}';

Map<String, dynamic> userData = jsonDecode(jsonString);

print(userData['name']); // Output: John Doe
print(userData['email']); // Output: [email protected]

You can also parse JSON data into a custom Dart object. To do this, you’ll need to create a class that represents the data, and then use jsonDecode to parse the JSON into an instance of that class:

class User {
  final String name;
  final String email;


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

String jsonString = '{"name": "John Doe", "email": "[email protected]"}';

User user = User.fromJson(jsonDecode(jsonString));

print(; // Output: John Doe
print(; // Output: [email protected]

This approach is especially useful when working with complex JSON structures. By using a custom class, you can define the structure of the data and provide getters and setters for the properties, making it easier to access and manipulate the data in your app.

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