Dart Model Tester is a VS Code extension that allows you to validate JSON data against your Dart model classes directly from a convenient sidebar UI. No need to run commands manually or leave VS Code—everything is interactive and real-time.
Features
🟢 Validate JSON against any Dart model class
🟢 Support for json_serializable annotated models
🟢 Interactive UI with:
JSON input box (paste JSON or load from file)
Dart model file picker
Class name input
🟢 Instantly see parsing results in the sidebar
🟢 Works with any Flutter/Dart project in your workspace
🟢 Lightweight and fast — no extra dependencies outside Dart SDK
Usage
After installing, you will see a Dart JSON icon in the Activity Bar (left sidebar).
Click the icon to open the Validator view.
Paste your JSON in the JSON Input box.
Select your Dart model file using the file picker.
Enter the Class Name of the model to validate against.
Click Run Validation.
✅ If parsing succeeds, you will see a SUCCESS message.
⚠️ If there are errors:
Entire Tack Trace will be displayed.
Notes
The extension uses Dart SDK installed in your system.
Ensure your project can run Dart files (i.e., it’s a proper Dart/Flutter project with models accessible).
Works with both plain Dart classes and json_serializable annotated models.
