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JSON to Dart Converter Online - Flutter Class Generator

Free online JSON to Dart converter. Generate Flutter class definitions with fromJson/toJson methods.

JSON to Dart

Convert JSON to Dart/Flutter classes

Features

  • Automatic type detection (String, int, double, bool, List, Map)
  • Null safety support with ? notation
  • Generated fromJson factory constructor
  • Generated toJson method for serialization
  • Support for nested objects and arrays
  • Customizable class name
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How to Use JSON to Dart

  1. Paste or upload your input data into the JSON to Dart input area
  2. Select the desired output format or conversion options
  3. Click Convert to transform your data instantly
  4. Copy the converted result or download the output file

Common Use Cases

  • Converting API JSON responses to Dart/Flutter classes
  • Generating type-safe Flutter model classes automatically
  • Creating serializable Dart objects from JSON data
  • Speeding up Flutter app development with auto-generated code

Frequently Asked Questions

Is JSON to Dart free to use?
Yes, JSON to Dart is completely free with no signup required. You can use it as many times as you need.
Is my data safe when using JSON to Dart?
Absolutely. All processing happens directly in your browser. Your data is never sent to any server or stored anywhere.
What formats does JSON to Dart support?
JSON to Dart supports the formats described above. Simply paste your input data and the tool will handle the conversion automatically.
Can I convert large files?
Yes, since all processing happens in your browser, you can convert files of any reasonable size. Very large files may take a moment to process.
Will the conversion preserve my data accurately?
Yes, the conversion is lossless and preserves all data accurately. The tool handles edge cases and special characters properly.