To get started with FastAPI, you need Python installed on your machine. It is highly recommended to use a virtual environment to manage your dependencies.
The --reload flag makes the server restart after code changes, which is perfect for development. You can now access your API at http://127.0.0.1:8000. Automatic Documentation
Path Parameters: Used to identify a specific resource. In /items/{item_id}, item_id is a path parameter. FastAPI uses Python type hints to validate the data type. fastapi tutorial pdf
In the example above, we saw both path and query parameters.
One of the most powerful features of FastAPI is its automatic interactive API documentation. Once your server is running, you can visit: To get started with FastAPI, you need Python
python -m venv venvsource venv/bin/activate # On Windows use venv\Scripts\activate
To save this tutorial as a PDF, you can use your browser's "Print" function (Ctrl+P or Cmd+P) and select "Save as PDF" as the destination. This will allow you to keep this guide as a handy reference for your future FastAPI projects. You can now access your API at http://127
FastAPI is a modern, high-performance web framework for building APIs with Python 3.8+ based on standard Python type hints. Its speed, ease of use, and automatic documentation have made it a favorite among developers looking to move beyond traditional frameworks like Flask or Django for RESTful services.
First, create a directory for your project and navigate into it: mkdir fastapi-projectcd fastapi-project Next, create and activate a virtual environment: