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JSON to Dart / Flutter Model

Dart classes with fromJson constructors for Flutter.

Runs in your browser

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Understanding · fromJson, toJson, and a build runner.

この詳細な解説章は現在、英語版のみで提供されています。上の変換ツールはあなたの言語で動作しますが、長文の解説記事はまだ翻訳されていません。

よくある質問

Quick answers.

Does this support Null Safety?

Yes. The generated code uses non-nullable types and required parameters where appropriate, matching modern Dart 2.12+ and Flutter standards.

How are nested JSON objects handled?

The tool recursively creates separate Dart classes for every nested object it finds to ensure your data model remains modular and clean.

Can I customise the root class name?

Yes. You can specify the name of the base class to match your data entity, such as `User` or `ProductResponse`.

Is my data sent to a server?

No. The conversion logic runs entirely within your browser sessions. Your JSON structure and variable names are never transmitted to our servers.

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