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YAML to Dart Converter

Paste a YAML document and get Dart classes with typed fields, optional final modifiers, and fromJson/toJson serialization methods.

Last updated: May 28, 2026

Client-Side Processing
Input Data Stays on Device
Instant Local Execution
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What is YAML to Dart Converter?

This tool converts a YAML document into Dart model classes. It parses YAML to JSON internally, then generates Dart classes with typed fields. Nested YAML mappings become nested Dart classes, sequences become List<T>, and fromJson/toJson factories are generated for easy JSON serialization — common in Flutter apps.

How to Use YAML to Dart Converter

1

Paste YAML into the input panel.

2

Set a root class name (optional).

3

Toggle final fields, nullable types, and fromJson/toJson generation.

4

Copy the generated Dart classes.

Common Use Cases

  • Generating Flutter model classes from a YAML API example.
  • Creating Dart models for a config-driven application.
  • Scaffolding Dart types before writing YAML parsing code.
  • Producing serializable Dart classes from YAML service definitions.

Example Input and Output

A small YAML mapping becomes a Dart class with fromJson/toJson.

YAML input
name: Alice
age: 30
active: true
Generated Dart class
class Root {
  final String? name;
  final int? age;
  final bool? active;

  Root({
    this.name,
    this.age,
    this.active,
  });

  factory Root.fromJson(Map<String, dynamic> json) {
    return Root(
      name: json['name'] as String?,
      age: json['age'] as int?,
      active: json['active'] as bool?,
    );
  }
}

Tip

For Flutter projects, consider using code generation packages like json_serializable for production serialization instead of hand-written fromJson/toJson.

Frequently Asked Questions

What does fromJson/toJson do?

fromJson creates a class instance from a Map (e.g., parsed JSON or YAML), while toJson converts the instance back to a Map for serialization.

How are YAML sequences handled?

YAML sequences become List<T> fields where T is inferred from the first element in the sequence.

Is my YAML sent anywhere?

No. All parsing and Dart generation happen locally in your browser.

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