JSON to Pydantic - Python Model Generator
Convert JSON to Python Pydantic BaseModel classes with full type annotations. Perfect for FastAPI, data validation, and modern Python development.
✓ 100% Free
🔒 Client-Side Only
👤 No Signup
Why Pydantic?
Pydantic is the most widely used data validation library for Python. It provides runtime type checking, data parsing, and serialization — all with standard Python type hints.
Common Use Cases
- FastAPI — Request/response models with automatic validation
- Config Management — Environment variables and settings
- Data Pipelines — ETL job data structures
- API Clients — Typed SDKs for external APIs
JSON to Pydantic FAQ
Which Pydantic version does the generator target?
Output uses Pydantic v2 syntax with BaseModel, Field(), and standard type hints compatible with FastAPI 0.100+.
How are nested objects handled?
Nested JSON objects become separate model classes with descriptive names derived from the parent key, then referenced in the parent model.
Is my JSON uploaded to a server?
No. Model generation runs entirely in your browser using client-side JavaScript.