FastAPI - Get Started

Before You Start

Python 3.8+

FastAPI requires Python 3.8 or higher

pip

Python package manager

Get It Running

Recommended

Quick Start

Create a FastAPI project.

First, open your Terminal:

⌘ + Space → type "Terminal" → press Enter

Create project directory

mkdir my-fastapi-app && cd my-fastapi-app

Create virtual environment

python3 -m venv venv

Activate it

source venv/bin/activate

Install FastAPI and Uvicorn

pip install fastapi uvicorn

Create main.py with your API

Run

uvicorn main:app --reload

Open http://localhost:8000

View auto-generated docs at http://localhost:8000/docs

First, open your Terminal:

Win + R → type "cmd" or "powershell" → press Enter

Create project directory

mkdir my-fastapi-app && cd my-fastapi-app

Create virtual environment

python -m venv venv

Activate it

venv\Scripts\activate

Install FastAPI and Uvicorn

pip install fastapi uvicorn

Create main.py with your API

Run

uvicorn main:app --reload

Open http://localhost:8000

View auto-generated docs at http://localhost:8000/docs

Example code:

# main.py
from fastapi import FastAPI

app = FastAPI()

@app.get('/')
def read_root():
    return {'Hello': 'World'}

@app.get('/items/{item_id}')
def read_item(item_id: int, q: str = None):
    return {'item_id': item_id, 'q': q}

Start Vibe Coding

Create your project, push to GitHub, and start coding with AI in one go.

First, make sure you have these installed:

Git - Version control
GitHub CLI - Create repos from terminal
Cursor - AI-powered code editor

Project Name

Download Setup Script Recommended

Download and run a script that sets up everything automatically.

How to run on Mac

1. Open Terminal (Cmd + Space, type "Terminal")

2. Navigate to Downloads: cd ~/Downloads

3. Run: chmod +x setup-*.sh && ./setup-*.sh

How to run on Windows

1. Open your Downloads folder

2. Double-click the .bat file

3. If warned, click "More info" → "Run anyway"

Manual Setup (Copy & Paste)

# Enter a project name above to generate your script

Paste this in your terminal to create your project, initialize git, push to GitHub, and open in Cursor.

Build with Claude Code

Use Claude Code to build your FastAPI project by describing what you want in plain English.

Get your Anthropic API key (one-time)

You'll need an API key to use Claude Code. It's free to sign up!

1. Go to console.anthropic.com and sign up or log in
2. Navigate to API Keys in the sidebar
3. Click Create Key and copy it somewhere safe

Get API Key

Add your API key to your system (one-time)

Run this in your terminal to save the key permanently. Replace your-api-key with your actual key.

echo 'export ANTHROPIC_API_KEY="your-api-key"' >> ~/.zshrc && source ~/.zshrc

This adds the key to your shell config so it's always available.

setx ANTHROPIC_API_KEY "your-api-key"

This sets a permanent environment variable. Restart your terminal after running this.

Install Claude Code (one-time setup)

Run this command once in your terminal from anywhere.

npm install -g @anthropic-ai/claude-code

Start Claude in your project

Navigate to your FastAPI project folder, then run:

claude

Describe what you want to build

Claude will read your project and help you build it. Try prompts like:

"Add a responsive navbar" "Create a contact form" "Add dark mode toggle" "Explain this code"

Learn more about Claude Code

Go Live

Ready to share your FastAPI project with the world? Deploy it in minutes.

Deploy Your Project

Learn More

FastAPI Documentation

FastAPI Tutorial

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