JSON TO DART
JSON to Dart Class
Generate Dart model classes with fromJson() and toJson() for Flutter.
Generate Dart model classes with fromJson() and toJson() for Flutter.
Dart is the programming language behind Flutter, Google's cross-platform mobile framework. Almost every Flutter app works with JSON APIs, and each data model needs fromJson and toJson methods. Writing these manually is repetitive and error-prone. This tool generates complete Dart classes with serialization methods.
Building Flutter apps that consume REST APIs. Learning Flutter and understanding JSON serialization. Rapid prototyping of mobile app data models. Refactoring existing Dart code to use proper data classes.
Paste your JSON data, set the class name and options, then click Convert. The generated Dart class includes: class definition, constructor, fromJson factory method, and toJson method. If you use json_serializable, the generated code works directly with build_runner for code generation.
Null Safety is a Dart feature that prevents null reference errors. Types are non-nullable by default - you must add ? to make them nullable (like String? instead of String). This catches many bugs at compile time instead of runtime.
fromJson is a factory method that creates a Dart object from a JSON map. toJson converts the Dart object back to a JSON map. These are the standard way to handle JSON serialization in Dart and Flutter.
Not necessarily - the generated code includes manual fromJson/toJson methods that work without any packages. However, json_serializable is recommended for larger projects as it auto-generates these methods and handles edge cases better.
Each nested object gets its own Dart class. The parent class references the child class type. This creates a clean, type-safe hierarchy that matches the JSON structure perfectly.