from fastapi import FastAPI app = FastAPI() @app.get("/") def read_root(): return {"Hello": "World"} Use code with caution. Run your server with: fastapi dev main.py Use code with caution.
Generates interactive OpenAPI documentation automatically. Type Safety: Uses Python type hints for data validation. Step 1: Prerequisites
Before jumping into the commands, it is important to understand why companies like Uber, Netflix, and Microsoft rely on it: It is on par with NodeJS and Go. download fastapi
Open your browser to http://127.0.0 . You will see the automatically generated API documentation that FastAPI provides out of the box. Offline Installation
If you chose the minimal installation, you will also need to "download" an ASGI server like Uvicorn to run your code: pip install uvicorn Use code with caution. Verifying the Installation from fastapi import FastAPI app = FastAPI() @app
To "download" and run FastAPI, you must have Python 3.8+ installed on your machine. You can check your version by running: python --version Use code with caution. Step 2: Setting Up a Virtual Environment (Recommended)
You can download the package from the Python Package Index (PyPI) using the pip command. There are two main ways to do this: Option A: The Standard Installation (Recommended) Type Safety: Uses Python type hints for data validation
If you want to keep your footprint small and manually select your dependencies, use: pip install fastapi Use code with caution. Step 4: Installing a Production Server