flutter jsonDecode UTF8

In Flutter, you can use the jsonDecode function from the dart:convert package to decode a JSON string into a Dart object. By default, jsonDecode assumes that the input string is encoded in UTF-8.

To use jsonDecode, you first need to import the dart:convert package in your Flutter project:

import 'dart:convert';

Then, you can call the jsonDecode function and pass in the JSON string as a parameter. Here's an example:

String jsonString = '{"name": "John", "age": 30}';
Map<String, dynamic> jsonMap = jsonDecode(jsonString);

In this example, jsonString is the JSON string that you want to decode, and jsonMap is a Map object that will hold the decoded JSON data. Note that the type of jsonMap is Map<String, dynamic>, which means it can hold key-value pairs where the keys are Strings and the values can be of any type.

After decoding the JSON string, you can access the values in the jsonMap using the keys. For example:

String name = jsonMap['name'];
int age = jsonMap['age'];

In this case, name will be assigned the value 'John', and age will be assigned the value 30.

That's it! You have successfully used jsonDecode to decode a JSON string in Flutter and access the values in the decoded JSON data.