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# jsonexample | ||
## `jsonexample` sample retired | ||
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A Flutter sample app that deserializes a set of JSON strings using three | ||
different libraries: `dart:convert`, `json_serializable`, and | ||
`built_value`. | ||
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## Goals for this sample | ||
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* Help you decide which of the three most common libraries for | ||
deserializing JSON is right for your project. | ||
* Provide you with example code for deserializing: | ||
* Simple and nested objects | ||
* Lists of primitive values | ||
* Maps containing primitive values | ||
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## The important bits | ||
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### `json_strings.dart` | ||
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The actual JSON to be deserialized. | ||
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### `dart_convert`/`json_serializable`/`dart_convert` | ||
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These folders contain code used to deserialize the simple and complex | ||
object models using one of the three libraries. They do the work of | ||
instantiating models and populating their fields. | ||
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### `tab_pages.dart` | ||
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Each tab page in the app deserializes one type of data with one library. | ||
These Widgets show what app code using the above libraries might look like. | ||
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## Generating | ||
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The lib/build_value and lib/json_serializable use build_runner to generate | ||
files. If you make a change to these files, you need to re-run the generator | ||
using `build_runner`: | ||
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``` | ||
flutter pub run build_runner build | ||
``` | ||
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## Questions/issues | ||
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If you have a general question about JSON serialization in Flutter, the | ||
best places to go are: | ||
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* [The FlutterDev Google Group](https://groups.google.com/forum/#!forum/flutter-dev) | ||
* [The Flutter Gitter channel](https://gitter.im/flutter/flutter) | ||
* [StackOverflow](https://stackoverflow.com/questions/tagged/flutter) | ||
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If you run into an issue with the sample itself, please file an issue | ||
in the [main Flutter repo](https://github.com/flutter/flutter/issues). | ||
The `jsonexample` sample has reached the end of it's useful life. It was great code | ||
when it has written, but the world has changed. Dart 3 introduced Patterns and | ||
records. There is also various JSON parsing tools like `json_serializable`. | ||
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For further information, please see: | ||
- The [Dive into Dart's patterns and records](https://codelabs.developers.google.com/codelabs/dart-patterns-records) | ||
codelab for a deep dive into Dart 3's patterns and records with an application to parsing JSON | ||
- The Flutter.dev documentation on [JSON and serialization](https://docs.flutter.dev/data-and-backend/serialization/json) |
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