FastAPI Best Practices

Project Structure

• app/main.py - Application entry
• app/routers/ - Route handlers
• app/models/ - SQLAlchemy models
• app/schemas/ - Pydantic schemas
• app/services/ - Business logic
• app/dependencies.py - Dependency injection

Pydantic Schemas

• Use separate schemas for input/output
• Use Field() for validation
• Use model_validator for complex validation
• Use Config for schema settings