🚀 Serverless Flask API on AWS Lambda with Zappa

This project demonstrates deploying a Flask web application serverlessly using AWS Lambda and API Gateway, powered by Zappa.

⚠️ Python Compatibility Notice

🐍 Zappa and AWS Lambda do not support Python 3.13 or newer.

If you are using Python 3.13+ locally, you must install Python 3.9 or any version between 3.7 and 3.12 to ensure compatibility.

Use tools like pyenv to manage multiple Python versions.

Example:

pyenv install 3.9.18
pyenv local 3.9.18

🧰 Stack

• Flask (Python micro-framework)
• AWS Lambda (serverless runtime)
• API Gateway (HTTP endpoint)
• Zappa (Python tool for serverless deployments)
• S3 (for deployment package storage)

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✅ Features

• Serverless HTTP API
• 100% pay-as-you-go (no EC2 or servers running)
• Easy CI/CD potential with GitHub + Zappa
• Great for small APIs, webhooks, and lightweight services

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📁 Project Structure

flask-serverless/
├── app.py
├── requirements.txt
├── zappa_settings.json
└── venv/

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🚀 Deployment Steps

1. Setup environment

python3 -m venv venv
source venv/bin/activate
pip install flask zappa

2. Initialize Zappa

zappa init

3. Deploy to AWS Lambda

zappa deploy dev

4. Update if needed

zappa update dev

🔄 Example Endpoint

Once deployed, visit:

https://your-api-id.execute-api.us-east-1.amazonaws.com/dev/ Response: Hello From Flask on AWS Lambda!

🧼 Cleanup

zappa undeploy dev

📌 Next Steps (Coming Soon)

• Rebuild using Terraform (Lambda, API Gateway, IAM)

• Add CI/CD via GitHub Actions