FastAPI Practical Case: Build a Simple Blog API with 50 Lines of Code

FastAPI is a modern, high-performance Python framework that supports asynchronous programming, type hints, and automatic API documentation, making it ideal for quickly building APIs. This article implements a simple blog API with CRUD functionality for articles using just 50 lines of code. First, install `fastapi` and `uvicorn`. Define `PostCreate` (request model) and `PostResponse` (response model) using `Pydantic`, and simulate an in-memory list `posts` to store articles. Five endpoints are implemented: `GET /posts` (retrieve all articles), `GET /posts/{post_id}` (single article), `POST /posts` (create, with 201 status code), `PUT /posts/{post_id}` (update), and `DELETE /posts/{post_id}` (with 204 status code). FastAPI's automatic parameter validation and status code handling are leveraged throughout. FastAPI automatically generates Swagger UI and ReDoc documentation, facilitating easy testing of the API. Key knowledge points include route definition, Pydantic data models, status codes, and automatic documentation. Potential extensions could include adding a database, user authentication, and pagination. This example demonstrates FastAPI's concise and efficient nature, making it an excellent starting point for beginners.