Using JSON

Most mobile and web apps use JSON for tasks such as exchanging data with a web server. This page discusses Dart support for JSON serialization and deserialization: converting Dart objects to and from JSON.

The following libraries and packages are useful across Dart platforms:

• dart:convert
  Converters for both JSON and UTF-8 (the character encoding that JSON requires).

• package:json_serializable
  An easy-to-use code generation package. When you add some metadata annotations and use the builder provided by this package, the Dart build system generates serialization and deserialization code for you.

• package:built_value
  A powerful, opinionated alternative to json_serializable.

JSON and serialization

Shows how Flutter apps can serialize and deserialize both with dart:convert and with json_serializable.

Fetch data from the internet

Demonstrates how to use package:http to retrieve data with a web server.

Unless stated otherwise, the documentation on this site reflects Dart 3.5.4. Page last updated on 2024-02-07. View source or report an issue.