JSONPydantic Model
JSON to Pydantic Model Generator
Generate Pydantic BaseModel classes from JSON data. Pydantic is the standard for data validation in Python, used by FastAPI, LangChain, and most modern Python frameworks. Paste an API response and get production-ready models.
Features
- Infers str, int, float, bool types
- Nested objects become separate BaseModel classes
- Arrays infer List[Type] annotations
- Optional fields for null values
- snake_case field naming convention
Frequently Asked Questions
What is Pydantic?
Pydantic is the most popular data validation library for Python. It uses Python type annotations to validate data and is the foundation of FastAPI, LangChain, and many modern Python frameworks.
Does the output work with FastAPI?
Yes. The generated Pydantic models can be used directly as FastAPI request/response models, query parameters, and dependency injection types.
How are nested objects handled?
Nested JSON objects become separate Pydantic BaseModel classes. The parent model references the child model by class name, maintaining proper type hierarchy.