How do FastAPI�s response models work and what benefits do they provide?

FastAPI’s response models are Python classes that define the structure and data types of HTTP responses. They leverage Pydantic for data validation, serialization, and documentation. When a route function returns a Pydantic model, FastAPI automatically converts it into JSON, checks the data against the model’s schema, and generates an OpenAPI schema.

The benefits include :

1. Data Validation : Ensures only valid data is returned.

2. Serialization : Converts complex data types to JSON.

3. Documentation : Auto-generates API docs based on the model.

4. Code Reusability : Models can be reused across different routes.

5. Error Handling : Automatically handles errors when data doesn’t match the model.