JSON to Dart
FreeGenerate Dart model classes from JSON data
class Root {
final int id;
final String name;
final bool active;
Root({required this.id, required this.name, required this.active});
}About JSON to Dart
In Flutter and Dart, parsing JSON cleanly means writing model classes with typed fields and fromJson constructors, and doing that by hand for every API response is a lot of boilerplate. This tool reads a JSON sample and generates Dart model classes so you can deserialize responses into real objects instead of juggling untyped maps.
Paste a representative JSON object and the converter creates Dart classes with typed fields, generating nested classes for nested objects. It is free, runs in your browser, needs no signup, and returns the classes instantly. Since the model is inferred from one sample, provide a complete example and review nullability and types, as Dart's null safety may need adjustments the sample alone cannot reveal.
Common uses
- Generating Dart models for an API response in a Flutter app
- Creating typed classes to replace raw map access in Dart
- Bootstrapping model classes from a sample JSON payload
- Building nested Dart models for a structured API response
- Saving boilerplate when wiring JSON into a Flutter project
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Accurate conversion
- Multiple formats
- Instant results
FAQ
Does it generate fromJson methods?
Generated models typically include parsing logic so you can build instances from a decoded JSON map, though you should verify it fits your setup.
How are nested objects handled?
Nested JSON objects become their own Dart classes referenced from the parent, keeping the model structured and typed.
Does it account for null safety?
Types are inferred from the sample. Review field nullability against Dart's null safety, since a single sample may not show every nullable field.
Should I provide a full sample?
Yes. A complete, representative JSON object produces the most accurate fields and types in the generated classes.
Can I use JSON to Dart on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.