JSON to Dart Converter
Convert JSON to Dart model classes with null safety, nested types, and fromJson/toJson methods. Free online tool for Flutter developers.
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What is JSON to Dart Converter?
The JSON to Dart Converter is a developer tool that transforms JSON samples into Dart model classes. It analyzes your JSON structure, infers types including nested objects and arrays, and generates production-ready code with null safety and serialization support.
Key Benefits
- Eliminates hours of repetitive boilerplate coding
- Produces null-safe Dart code following best practices
- Supports both manual and json_serializable workflows
- Keeps sensitive API payloads private in your browser
Common Use Cases
- •Generating models from API response payloads in Flutter apps
- •Creating data classes for JSON config files
- •Prototyping Dart data layers from sample data
- •Learning Dart serialization patterns from real examples
How to Use JSON to Dart Converter
- Paste your JSON: Paste a JSON object or array into the input box on the left side.
- Configure options: Set the root class name, choose manual or json_serializable mode, and toggle nullable properties or camelCase fields.
- Generate Dart code: Click "Generate Dart" to produce model classes with fromJson and toJson support.
- Copy or download: Copy the generated code to your clipboard or download it as a .dart file for your Flutter project.
Key Features
- Generates Dart model classes with null-safe types
- Supports nested objects and List types
- Optional json_serializable annotations with @JsonKey
- Customizable root class name and camelCase fields
- Generates fromJson factory and toJson method
- 100% client-side processing, your data never leaves the browser
Frequently Asked Questions
Is the JSON to Dart Converter free to use?
Yes, the tool is completely free with no usage limits. All conversion happens locally in your browser, so your JSON data is never uploaded to any server.
What is the difference between manual and json_serializable mode?
Manual mode generates complete fromJson factory constructors and toJson methods that work without dependencies. The json_serializable mode generates annotated classes that rely on the json_serializable package and build_runner to produce the serialization code.
Does the tool support nested JSON and arrays?
Yes. Nested objects become separate Dart classes with proper references, and arrays become List types with correctly inferred item types.
Can I use the generated code in my Flutter project?
Absolutely. Copy the code or download it as a .dart file and add it to your lib/models folder. For json_serializable mode, add the required packages to pubspec.yaml and run build_runner.