JSON Input

Dart Output

What is JSON to Dart Converter?

Need to generate Dart classes from your JSON (JavaScript Object Notation) data? This tool does that instantly. Perfect for Flutter developers who need to deserialize JSON into strongly-typed Dart objects. Generate model classes with proper types, json_serializable annotations, and nullable type support automatically.

According to Dart documentation, strongly-typed classes ensure type safety and make your Flutter apps more maintainable. Our converter analyzes your JSON structure and generates proper Dart classes with nullable types, json_serializable integration, and best practices. First, validate your JSON using our JSON Validator, then convert it to Dart. You can also format your JSON with our JSON Formatter first if needed.

Everything happens in your browser – your JSON never leaves your computer. Convert, download, and use your Dart classes right away in your Flutter projects.

How to Use JSON to Dart

Follow these steps to convert JSON to Dart classes. Each step uses the actual buttons and panels on this page.

Paste, Upload, or Load Sample

Paste your JSON into the left JSON Input panel, or click Upload to load a .json or .txt file. Click Sample to see example JSON. Example input:

{"subscriberId":"SUB-1001","plan":"Unlimited 5G","dataUsage":45.2,"status":"active"}

Invalid JSON will show an error. Use our JSON Validator first if unsure. Configure class name, package, json_serializable, and nullable types in the options above.

View Generated Dart Output

The right Dart Output panel shows the generated Dart classes instantly. Each nested object becomes its own class. Arrays become List types. The generator validates your JSON – if it's valid, it generates Dart code; if not, you'll see an error explaining the problem.

Copy, Download, or Adjust

Click Copy to copy the Dart code to your clipboard. Click Download to save as a .dart file. Need different options? Adjust the class name, toggle json_serializable, enable nullable types, and see the output update instantly. Use Clear to start fresh.

When You'd Actually Use This

Flutter Development

Generate Dart classes from JSON API responses for Flutter apps. Create models for REST APIs or JSON-based configurations. Perfect for Flutter's JSON processing needs.

Web Applications

Create Dart classes from JSON data for Dart web apps. Generate data models for JSON-based APIs or configurations. Perfect for Dart web development.

Server-Side Dart

Generate Dart classes from JSON data for server-side Dart applications. Create data models for JSON-based APIs or configurations. Perfect for Dart server frameworks.

Code Generation

Generate Dart code from JSON data structures. Perfect for creating data models, DTOs, or entity classes from JSON schemas or API responses.

Common Questions

Is my JSON data stored?

No. All code generation happens in your browser using JavaScript. Your JSON data never leaves your computer.

What Dart versions are supported?

Our converter generates code compatible with Dart 2.12+ which supports null safety. The generated code uses modern Dart conventions with nullable types and json_serializable integration.

Do I need to add json_serializable to my project?

If you enable the json_serializable option, you'll need to add the json_serializable and json_annotation packages to your pubspec.yaml. The generated code includes the necessary imports and annotations.

Can I convert complex nested JSON?

Yes. The converter handles deeply nested objects and arrays. Each nested object becomes its own class, and arrays are properly typed with List. The tool automatically handles naming conventions and avoids class name conflicts.

What about null handling?

Enable the "Nullable Types" option to generate fields with ? (nullable) annotations. This is recommended for JSON data that may contain null values, which is common with APIs.

Can I use this for Flutter?

Absolutely. This tool is designed specifically for Flutter development. The generated Dart classes work perfectly with Flutter's JSON deserialization patterns and json_serializable library.

Other JSON Tools You Might Need

Converting to Dart is just one JSON task. Here are other tools that work well together: