About
DT

JSON to Dart

Generate Dart and Flutter model classes from JSON

Usage guide and feature details

Where can I use JSON to Dart models?

Generated Dart data classes are useful for Flutter API clients, state management and local data structures, reducing repetitive field and constructor declarations.

JSON to Dart is a free online utility for development, testing, and everyday data tasks. It is designed to Generate Dart and Flutter model classes from JSON. No software installation or account is required.

Practical example and boundaries

Generate a Flutter model from API JSON

The generator converts JSON into Dart classes with final fields, required constructor parameters, nested models and fromJson/toJson methods for a practical Flutter API-model starting point.

Example input

{"id":7,"display_name":"Lin","tags":["flutter"],"profile":{"score":98.5}}

Expected output

class RootObject {
  final int id;
  final String displayName;
  final List<String> tags;
  factory RootObject.fromJson(Map<String, dynamic> json) { ... }
}

Limitations and cautions

A single sample cannot reveal every optional API field. Empty arrays, nulls, union types, enums and Freezed or json_serializable annotations require manual changes.

Key features of JSON to Dart

  • Process input instantly and spend less time switching between editors, terminals, and third-party apps.
  • Calculations run in your current browser by default, making the tool suitable for code, configuration, and debugging data.
  • Use essential features without registration, sign-in, or routine usage limits.
  • Works on desktop and mobile browsers with clear results that are easy to edit, copy, or download.

How to use JSON to Dart

  1. Enter, paste, or select the content in the tool above, then adjust any available options.
  2. Choose the relevant action and JSON to Dart will process and validate the input directly in your browser.
  3. Review the output, make any required changes, then copy the result or download the available file.

Common uses for JSON to Dart

Use JSON to Dart while building front-end pages, debugging APIs, reviewing configuration, preparing test data, or working on technical documentation. It helps you Generate Dart and Flutter model classes from JSON, which is useful for quick checks, one-off conversions, and repetitive development tasks.

Frequently asked questions about JSON to Dart

Does the generated Dart code support null safety?

It emits explicit types and required parameters, but can only infer nullability from the sample. Add nullable types and defaults according to the real API contract.

Is JSON to Dart free to use?

Yes. JSON to Dart is free to use without registration and is designed to Generate Dart and Flutter model classes from JSON.

Is my input uploaded when I use JSON to Dart?

This tool runs locally in your browser. Your input is never sent to our servers.