JSON to Dart Converter

Generate Dart classes from JSON with factory constructors, toJson methods, and null safety support. Perfect for Flutter API integrations.

100% client-side. Your data never leaves your browser.

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Smart Type Inference

Automatically maps JSON types to Dart equivalents: String, int, double, bool, DateTime, List<T>, and custom classes with null safety support.

Full Serialization

Generates factory constructors for fromJson and instance methods for toJson, handling nested objects and arrays automatically.

Null Safety

Full Dart null safety support with nullable types (Type?). Null values in JSON produce nullable properties with proper null checks in serialization methods.

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Frequently Asked Questions

How do I convert JSON to Dart classes?
Paste your JSON data or upload a .json file. The tool analyzes the structure and generates Dart classes with proper types, constructors, and serialization methods. Nested objects become separate classes with PascalCase names.
Does it generate fromJson and toJson methods?
Yes! The tool automatically generates factory constructors for fromJson and instance methods for toJson. These methods handle type conversions, nested objects, lists, and null safety. You can toggle these features on or off as needed.
How are nested JSON objects handled?
Nested objects are extracted into separate Dart classes with PascalCase names. The fromJson and toJson methods automatically handle nested class instantiation and serialization, creating clean, maintainable code.
Does it support Dart null safety?
Yes! Null safety is enabled by default. Null values in JSON produce nullable types (Type?), and the generated code uses null-aware operators and proper type checks in serialization methods.
Can I generate copyWith methods?
Yes! Enable the copyWith option to generate immutable data class patterns. This method creates modified copies of objects while maintaining immutability, perfect for Flutter state management with providers like BLoC or Riverpod.