JSON → Dart Models
Generate Dart model classes from JSON. Supports nested models, null safety, and fromJson/toJson.
JSON Input
Generated Dart Code
Paste JSON to generate Dart models
JSON to Dart Model Generator
Paste any JSON object and get ready-to-use Dart model classes for Flutter apps. Toggle null safety, fromJson/toJson factories, and set your root class name. Nested objects are automatically extracted into separate named classes.
Frequently Asked Questions
- Does this generate null-safe Dart code?
- Yes. With null safety enabled, the generator adds ? nullable type annotations for fields that could be null. It follows Dart 2.12+ null safety conventions.
- What does fromJson/toJson do?
- fromJson is a factory constructor that creates a model instance from a Map<String, dynamic>. toJson returns the model as a Map for JSON serialization. Both are required for most REST API workflows in Flutter/Dart.
- Does it handle nested objects?
- Yes. Nested JSON objects generate separate named Dart classes. The parent class references child classes by name.
- Is my JSON sent to a server?
- No. All code generation runs entirely in JavaScript in your browser. Your JSON data never leaves your device.