What JSON to class conversion means
From sample to model
APIs send JSON, while application code often works with classes or models. Conversion uses sample JSON to infer field names, value types, arrays, nested objects, and nullable values.
Supported output languages
C# Classes
Useful for .NET APIs, services, and typed application models.
Java POJO
Useful for Java backend applications and API clients.
Python Classes
Useful for scripts, data processing, and typed model starters.
Dart Classes
Useful for Flutter apps and Dart API response models.
How to get better generated classes
Use realistic samples
Paste a realistic sample JSON object or array with clear field names from the real API.
Include structure
Include nested objects, arrays, and null values when your real API response uses them.
Name the root class
Set a meaningful root class name before generating code.
Generated code is starter code
Review before production
Generated code is starter code, not a final production contract. Review class names, nullable fields, number types, serialization settings, annotations, package structure, and framework conventions.
Local conversion
JSON parsing and class generation are designed to happen in your browser.