Basic Endpoint Syntax
To define a GET endpoint, you apply the @app.get("/path") decorator to a standard Python function. The string argument within the decorator defines the URL path, while the function beneath it contains the logic executed when the endpoint is called.
Automatic JSON Serialization
One of FastAPI’s core strengths is its seamless handling of data. By default, the framework automatically converts Python return values—such as dictionaries, lists, or Pydantic models—into JSON format for the client. This removes the need for manual serialization within your application logic.
Parameters and Validation
FastAPI allows you to define path parameters, query strings, and validation rules directly within the function signature. Because it leverages Python type hints, the framework automatically validates incoming data and generates descriptive error messages if the input does not meet the specified requirements.
Conclusion
The streamlined approach to defining endpoints makes FastAPI highly productive for developers. It combines readability with powerful under-the-hood features like automatic documentation and asynchronous support.