FreeDev Tools

JSON to Dart

Generate Dart classes with fromJson factories from JSON — ready for Flutter apps.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Paste sample JSON

    Paste a representative response body from your API.

  2. 2

    Review classes and types

    Check that int vs double inference matches your API — a field that is sometimes 1 and sometimes 1.5 should be double.

  3. 3

    Copy into your Flutter project

    Paste the classes into a .dart model file and parse with Root.fromJson.

Frequently Asked Questions

A class per JSON object with final typed fields, a named-parameter constructor, and a fromJson factory that safely maps the JSON, including nested classes and typed lists.

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