@app.get("/users/{user_id}") def get_user(user_id: int): return {"user_id": user_id} Use code with caution.

To start with FastAPI, you'll need to install it using pip:

@app.get("/items/{item_id}") def read_item(item_id: int): return {"item_id": item_id} Use code with caution.

: Based on open standards like OpenAPI and JSON Schema . 2. Setting Up Your Environment

One of FastAPI's best features is its built-in OpenAPI documentation. You do not need to configure anything extra to get a beautiful user interface for testing your endpoints.

Based on (and fully compatible with) the open standards for APIs: OpenAPI and JSON Schema 1. 1. Setting Up Your Environment

If you want the most up-to-date, beautiful FastAPI PDF, you must build it yourself. Here is the professional method using and Material for MkDocs (the same engine that runs the official docs).

: Uses Python type hints to reduce developer errors by roughly 40%. Async-First : Native support for , making it ideal for high-concurrency tasks. Step 1: Installation

Open your browser and navigate to http://127.0.0.1:8000 . You will see the JSON response: {"message": "Welcome to the FastAPI Tutorial"} . Accessing Interactive Documentation

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Provide a list of to practice your skills?

Next, install FastAPI along with , an ASGI server used to run your application. pip install fastapi uvicorn[standard] Use code with caution. 2. Your First FastAPI Application