Dependency Injection allows you to write a piece of logic once and "inject" it into any endpoint that needs it.

Making Error Handling Consistent and Centralized by Using Global Exception Handlers

Using HTTP Status Codes & Exception Handling to Communicate Errors and Messages Correctly

Using Pydantic models to define response schemas in FastAPI.

Adding constraints and validation to path and query parameters in FastAPI.

Using request bodies to create and update data in FastAPI. Mocking a database.

Using query parameters to filter and paginate data in FastAPI. Query and path params compared.

Path Parameters and Python type hints are FastAPI "magic" under the hood.