INPUT - JSON
OUTPUT - Dart
Output will appear here
100% client-side
Output will appear here
Generate Dart classes with fromJson and toJson methods from JSON using our free JSON to Dart converter. The tool produces null-safe Dart 3 code with properly typed fields, nested class generation, and Flutter-ready serialization. Ideal for Flutter developers building apps that consume REST APIs.
Try Convert All - paste JSON once, see TypeScript, Go, YAML, and 15 more formats instantly.
Enter a JSON object in the input editor. The converter supports nested objects, arrays, and nullable fields commonly found in REST API responses.
The output pane shows Dart classes with factory fromJson() constructors and toJson() methods, ready for integration with Flutter networking code.
Copy the classes or download a .dart file. Drop them into your lib/models directory and use them with http or Dio for API response parsing.
Yes. After fetching a JSON response with the http package, you can pass the decoded JSON map directly to the fromJson() factory constructor. No additional packages like json_serializable are required.
Yes. The generated classes use Dart null-safety syntax. Nullable JSON fields are typed with ? and non-nullable fields use the required keyword in constructors, fully compatible with Dart 3 and Flutter 3.10+.
Each nested object generates its own Dart class with fromJson/toJson methods. The parent class instantiates the child class inside its own fromJson factory, creating a recursive deserialization chain.
The generated classes include manual fromJson/toJson methods. If you prefer json_serializable, you can remove those methods and add @JsonSerializable() annotations. The field types and class structure will still be correct.