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FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.7+ based on standard Python type hints. It is designed to be easy to use, while also being efficient and scalable. In this tutorial, we will explore the basics of FastAPI and demonstrate various examples to help you get started.
Before we begin, let's install FastAPI and an ASGI server, such as Uvicorn, which is commonly used to run FastAPI applications.
Now, let's create a simple FastAPI application.
Save the code in a file named main.py.
To run the application, use Uvicorn:
Now, you can visit http://127.0.0.1:8000 in your browser to see the API documentation.
FastAPI makes it easy to define path parameters in your API. Here's an example:
In this example, the item_id parameter is extracted from the path, and FastAPI automatically converts it to an integer.
You can also handle query parameters easily:
In this case, skip and limit are query parameters with default values.
FastAPI allows you to use Python's type hints for request and response models:
In this example, the create_item endpoint expects a JSON payload that can be automatically converted to the Item model.
FastAPI supports dependency injection for managing dependencies in your application:
Here, get_query is a dependency that provides default values for query parameters.
FastAPI is a powerful framework for building APIs in Python. This tutorial covered some of the basic concepts and features, but there is much more to explore. Refer to the official documentation for detailed information and advanced usage. Happy coding!
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