YAML Input

Dart Output

What Is YAML to Dart Conversion?

YAML to Dart conversion transforms YAML (YAML Ain't Markup Language) data structures into Dart class definitions. Each top-level YAML key becomes a class with typed fields, a constructor, and a fromMap factory method for easy deserialization.

The converter maps YAML types to their Dart equivalents: strings become String, integers become int, floats become double, booleans become bool, lists become List<dynamic>, and null values become nullable types. Fields are declared as final, promoting immutability consistent with Effective Dart guidelines.

This tool is particularly useful for Flutter development where Dart data classes are commonly used to model API responses, configuration objects, and local data. The generated code is compatible with manual JSON/YAML serialization workflows.

How to Convert YAML to Dart

Follow these steps to generate a Dart class from your YAML data:

Paste or Upload Your YAML

Enter your YAML content in the left panel, or click Upload to load a .yaml or .yml file. Example:

user:
  name: Alice
  age: 30
  active: true

Auto-Conversion

The converter instantly generates a Dart class with final fields, a named constructor, and a fromMap factory based on your YAML structure.

Copy or Download

Click Copy to copy the Dart code to your clipboard, or click Download to save it as a .dart file ready to add to your Flutter or Dart project.

Common Use Cases

Flutter Data Models

Generate Dart model classes from YAML API documentation or mock data for use in Flutter apps with clean, strongly-typed data objects.

Configuration Parsing

Convert YAML configuration files to Dart classes for use with Flutter's pubspec.yaml dependencies or custom config loading logic.

API Response Modeling

Transform YAML-documented API responses into Dart classes with fromMap factories, ready for integration with http or dio packages.

Code Generation Prototyping

Quickly prototype Dart data classes from YAML specs before wiring up full code generation tools like json_serializable or freezed.

Frequently Asked Questions

What Dart type does a YAML null become?

YAML null values are mapped to dynamic nullable types in the generated Dart class. The fromMap factory will assign the value directly without type casting.

Are nested YAML objects supported?

Nested objects are represented as Map<String, dynamic> in the generated Dart class. For deeply nested structures, you may want to create separate classes for each level manually or use a full code generation tool.

Is the generated code compatible with json_serializable?

The generated code uses a manual fromMap pattern. To use json_serializable, you would add @JsonSerializable() annotations and run dart run build_runner build.

Can I use this for Flutter projects?

Yes! The generated Dart classes work perfectly in Flutter projects. The final fields and fromMap factory pattern is a common Flutter convention for immutable data models.

Does this tool work offline?

Yes. All YAML to Dart conversion is performed entirely in your browser using JavaScript. No data is sent to any server.

Related Tools

Explore these related YAML and Dart tools:

YAML to Dart Converter