JSON Formatter / Beautifier
Format and beautify JSON instantly with proper indentation.
Open JSON Formatter / Beautifier
JSON to Dart Model Generator
Generate Dart model classes with fromJson/toJson from JSON samples.
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Frequently asked questions
Common questions about this tool.
Dart is a client-optimized programming language developed by Google, used primarily for building mobile, desktop, and web applications with the Flutter framework.
Yes. When "Nullable types" is enabled, the generator uses Dart's null safety syntax (Type?) for fields that may contain null values.
fromJson is a factory constructor that creates a Dart object from a Map (typically parsed from JSON). toJson serializes the object back into a Map. Both methods enable JSON serialization/deserialization in Dart models.
Classes provide type safety, autocomplete in IDEs, and documented structure. Raw maps lack compile-time checking and make refactoring harder in large Flutter projects.
The generated models reflect your sample JSON shape but may need adjustments for edge cases like custom date formats, enums, or deeply nested generics.