FastAPI Crash Course Tutorial

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.7+ based on standard Python type hints, designed to be easy to use and to build on.

In this crash course tutorial, we will cover the basics of FastAPI and how to build a simple API using this powerful framework.

Setting Up FastAPI

First, you need to install FastAPI and the web server used by FastAPI, Uvicorn, using pip:

pip install fastapi
pip install uvicorn

Creating a Minimal FastAPI App

Once you have FastAPI and Uvicorn installed, you can create a minimal FastAPI app in a file named “main.py” with the following code:

from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def read_root():
    return {"Hello": "World"}

This code sets up a FastAPI app and creates a single route that returns a JSON response with the message “Hello, World”.

Running the FastAPI App

You can run the FastAPI app using the Uvicorn server by running the following command in your terminal:

uvicorn main:app --reload

Once the server is running, you can visit http://127.0.0.1:8000/ in your browser to see the “Hello, World” message.

Creating More Routes

FastAPI makes it easy to create more routes for your API. You can define new routes using the @app.get, @app.post, @app.put, and @app.delete decorators, depending on the HTTP method you want to use.

Conclusion

FastAPI is a powerful and easy-to-use framework for building APIs with Python. In this crash course tutorial, we covered the basics of setting up FastAPI, creating a minimal app, running the app, and creating more routes. This is just the tip of the iceberg – FastAPI has many more features and capabilities that make it a great choice for building APIs. Check out the FastAPI documentation for more information and Happy coding!