JSON to Python Class
Generate Python dataclasses, Pydantic models, or plain classes from JSON. Includes type hints and from_dict helpers.
About this tool
Generate Python dataclasses or typed models from JSON samples so you can work with structured data without hand-writing every field.
Example use case: Convert API JSON into a Python dataclass for a FastAPI or script project.
Style:
Root class:
Frequently Asked Questions
What is a Python dataclass?▾
A dataclass (Python 3.7+) is a class decorated with @dataclass that automatically generates __init__, __repr__, and __eq__ methods based on its field annotations.
What is Pydantic?▾
Pydantic is a Python library for data validation using type annotations. Pydantic models automatically validate and parse data, making them ideal for API request/response schemas.
How are snake_case names handled?▾
JSON keys are automatically converted to snake_case for Python field names. For Pydantic, a Field(alias=...) is added when the JSON key differs from the Python field name.