FastAPI installation and setup

Introduction

FastAPI helps you build web apps and APIs quickly and easily. Installing it sets up the tools you need to start coding your app.

You want to create a web API to share data with other apps.

You need a fast and simple way to build a backend for your website.

You want to learn modern Python web development.

You want to test ideas quickly with minimal setup.

You want automatic docs for your API without extra work.

Syntax

FastAPI

pip install fastapi[all]

Use pip to install FastAPI and all recommended tools like Uvicorn server.

The [all] installs extra packages for full features like automatic docs and async support.

Examples

Installs only the core FastAPI package without extra tools.

FastAPI

pip install fastapi

Installs FastAPI plus recommended extras like Uvicorn for running the app.

FastAPI

pip install fastapi[all]

Installs FastAPI version 0.95.0 or newer with all extras.

FastAPI

pip install "fastapi[all]>=0.95.0"

Sample Program

This is a simple FastAPI app that returns a greeting message at the home URL. Run it with python filename.py after installing FastAPI and Uvicorn.

Open http://127.0.0.1:8000/ in your browser to see the message.

FastAPI

from fastapi import FastAPI
import uvicorn

app = FastAPI()

@app.get('/')
def read_root():
    return {"message": "Hello, FastAPI!"}

if __name__ == '__main__':
    uvicorn.run(app, host='127.0.0.1', port=8000)

Important Notes

Always use a virtual environment to keep your project packages separate.

Uvicorn is the recommended server to run FastAPI apps.

After installation, you can start your app with uvicorn filename:app --reload for auto-reload on code changes.

Summary

FastAPI installation uses pip install fastapi[all] to get all needed tools.

Uvicorn runs your FastAPI app locally for testing.

Simple setup lets you start building APIs quickly with Python.