json_object_lite 2.1.1

json_object_lite #

Build Status

json_object_lite allows dot notation access to JSON.parse'd objects, for Dart, lite version.

This package is a re-implementation of the json_object package by Chris Buckett except it doesn't use mirrors and hence is a much lighter version. You of course lose the JSON serialization/deserialization of the original package, however there are more advanced packages you can use for this purpose, e.g dson.

Other than that this is a faithful, lighter, re-implementation intended as a drop in replacement for the original JsonObject. Please see the json_object documentation for further details.

Note that for compatibility with Dart 2.0 only construction from strings is now supported, there are also a few other more minor updates, see the example for more details.

Linter updates

Issue 3

Dart 2.0 updates, issue 2

Pub updates

Strong mode updates for pub

Fix immutability to follow that of json_object, not reverse it

Fix failing test in Chrome

Issue 1, library name bug

Initial Release


/// This example is taken from the following article :-
/// http://www.dartlang.org/articles/json-web-service/

import 'package:json_object_lite/json_object_lite.dart';

// ignore_for_file: omit_local_variable_types
// ignore_for_file: unnecessary_final
// ignore_for_file: cascade_invocations
// ignore_for_file: avoid_print

/// The Dart 2.0 update has changed how JsonObjectLite is used, previously
/// you could do this :-
/// JsonObjectLite o = new JsonObjectLite.fromJSonString('........');
/// print(o.bob);
/// print(o.fred);
/// ....
/// If you do this now the o.bob line will be flagged by the analyser as
/// 'the getter bob is not defined.....' which is correct, its not.
/// This was suppressed in Dart 1.0 by annotating the class with 'proxy'.
/// This annotation has been deprecated in Dart 2.0 hence the error.
/// The fix for Dart 2.0 is to do this :-
/// dynamic o = new JsonObjectLite.fromJSonString('........');
/// Declaring the created object as dynamic gives the analyzer
/// no clues about the objects structure and hence it produces no errors.
/// This is unfortunate in the fact the user code has to change to
/// accommodate this but in the long run its cleaner as we now know that
/// we don't know the object structure if you see what I mean.
/// An example taken from the dartlang article for JSON object, found here
/// https://webdev.dartlang.org/articles/get-data/json-web-service.

class LanguageWebsite extends JsonObjectLite<dynamic> {
  LanguageWebsite(); // default constructor (empty) implementation

  factory LanguageWebsite.fromJsonString(String json) {
    // from JSON constructor implementation
    final LanguageWebsite languageWebsite =
        LanguageWebsite(); // create an empty instance of this class
    // Create an instance of JsonObjectLite, populated with the json string and
    // injecting the _LanguageWebsite instance.
    final JsonObjectLite<dynamic> jsonObject =
        JsonObjectLite<dynamic>.fromJsonString(json, languageWebsite);
    return jsonObject; // return the populated JsonObject instance

  factory LanguageWebsite.fromJsonObject(JsonObjectLite<dynamic> jsonObject) =>
      JsonObjectLite.toTypedJsonObjectLite(jsonObject, LanguageWebsite());

class Language extends JsonObjectLite<dynamic> {
  Language(); // empty, default constructor

  factory Language.fromJsonString(String json) =>
      JsonObjectLite<dynamic>.fromJsonString(json, Language());
  // as _LangaugeWebsite, return an instance
  // of JsonObjectLite, containing the json string and
  // injecting a _Language instance

int main() {
  const String responseText = '''
  "language": "dart", 
  "targets": ["dartium","javascript"], 
  "website": {
    "homepage": "www.dartlang.org",
    "api": "api.dartlang.org"
  final dynamic data = Language.fromJsonString(responseText);

  // Tools can now validate the property access
  print(data.language); // should be dart
  print(data.targets[0]); // should be dartium

  // Nested types are also strongly typed
  final dynamic website =
      LanguageWebsite.fromJsonObject(data.website); // contains a JsonObjectLite
  website.isImmutable = false; // Now we can extend it
  website.homepage = 'http://www.dartlang.org';

  return 0;

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  json_object_lite: ^2.1.1

2. Install it

You can install packages from the command line:

with pub:

$ pub get

with Flutter:

$ flutter pub get

Alternatively, your editor might support pub get or flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:json_object_lite/json_object_lite.dart';
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We analyzed this package on Feb 14, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.5


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev <3.0.0
Dev dependencies
build_runner ^1.6.2
build_test ^0.10.8
build_web_compilers ^2.1.4
dart_style ^1.2.9
dartdoc ^0.28.4
test ^1.6.5