dart_qjson

Immutable JSON wrapper for Dart with Qt-style API. Inspired by QJsonObject and QJsonArray from Qt. Designed to work with Variant types from dart_qvariant.

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Features

• Immutable JsonObject and JsonList wrappers
• Safe access to values using Variant
• Strong separation of primitives, lists, and objects
• Supports parsing from JSON string
• Converts back to Dart map/list or JSON string

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Installation

dart pub add dart_qjson

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Example (Dart)

import 'package:dart_qjson/dart_qjson.dart';

void main() {
  final jsonString = '''
  {
    "user": {
      "id": 1,
      "name": "Alice",
      "isActive": true
    },
    "tags": ["dart", "flutter"],
    "score": 42.5,
    "metadata": null
  }
  ''';

  final jsonObject = JsonObject.fromJsonString(jsonString);

  final user = jsonObject.getObject("user");
  print("User ID: ${user?.get("id")?.toInt()}");
  print("User Name: ${user?.get("name")?.toText()}");

  final tags = jsonObject.getList("tags");
  for (var i = 0; i < (tags?.length ?? 0); i++) {
    print("Tag $i: ${tags?.get(i)?.toText()}");
  }

  final score = jsonObject.get("score");
  print("Score: ${score?.toDouble()}");

  final metadata = jsonObject.get("metadata");
  print("Metadata is null: ${metadata == null}");

  print("Back to JSON: ${jsonObject.toJsonString}");
}