Creating First REST API with FastAPI

Building a REST API in FastAPI involves decorating Python functions to handle specific HTTP methods. Using the @app decorator, you can define routes and manage requests with minimal boilerplate:

• @app.get: Retrieve data
• @app.post: Create data
• @app.put / @app.patch: Update data
• @app.delete: Remove data

Below is an example of a basic get route that returns a "Hello, FastAPI" message:

Now, start the server using command:

uvicorn main:app --reload

Open the browser and open http://localhost:8000/docs or http://127.0.0.1:8000/docs . You will be able to see the Swagger UI Home page as below: 👁 Swagger UI

Now try to Execute the API, you will get the success status with 200 code. The Response will be as shown below:

CRUD Operations

Below is an example demonstrating CRUD operations using FastAPI:

Explanation:

• app = FastAPI(): creates an app instance.
• @app.post() defines the endpoint to create a new item.
• @app.get() defines the endpoint to retrieve an item by ID.
• @app.put() defines the endpoint to update an existing item.
• @app.delete() defines the endpoint to delete an item.

For more details on CRUD operations, refer to the: FastAPI | CRUD Operations.