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Format and beautify JSON instantly with proper indentation.
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JSON to Python Pydantic Model Generator
Generate Python Pydantic BaseModel classes from JSON samples.
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Frequently asked questions
Common questions about this tool.
Pydantic is a Python library for data validation using Python type annotations. It's commonly used with FastAPI and other Python web frameworks for request/response modeling.
BaseModel is the base class for Pydantic models. It provides automatic type validation, JSON (de)serialization, and schema generation from your type-annotated fields.
Optional[T] = None marks a field as not required. When the JSON key is missing, Pydantic will use None as the default value instead of raising a validation error.
Yes. Pydantic models are natively supported by FastAPI for automatic request validation, OpenAPI schema generation, and interactive API docs.
This future import makes all annotations be treated as strings (PEP 563), allowing forward references and reducing import-time evaluation issues with Pydantic models.