This guide walks through creating a serverless web application using AWS Lambda, API Gateway, and DynamoDB.

• AWS Account
• Basic knowledge of AWS services
• Python (for the Lambda function)

1. Go to the DynamoDB console.
2. Create a new table with the following configuration:
   • Primary/Partition Key: Email

1. Navigate to the IAM console and create a new role for Lambda with the least-privilege model.
2. Attach the following permissions:
   • DynamoDB Access (to allow the Lambda function to interact with the table)
   • CloudWatch Logs Access (to monitor logs)

1. In the Lambda console, create a new function.
2. Select Python as the runtime.
3. Assign the IAM role created in the previous step to the Lambda function.

1. Go to the API Gateway console.
2. Create a new API.
3. Add a Resource to serve as the endpoint for incoming requests.

1. For the resource, create a POST method.
2. Select the integration type and link it to the Lambda function.
3. Click Save.
4. Enable CORS on the resource:
   • Select the resource.
   • Enable CORS with default options.

1. Click Deploy API.
2. Create a new stage (e.g., dev, prod).
3. Note the Invoke URL generated after deployment.

1. Open your script.js file.
2. Update the API_URL with the Invoke URL from API Gateway.
3. Open index.html and fill out the form.

1. Submit the form and check the DynamoDB table to see if the data is saved.
2. If the data isn’t saving, review your configurations and ensure all steps are completed correctly.

project-folder/
│-- Frondend/index.html
│-- Frondend/script.js
│-- Lambda/lambda_function.py

Credit: https://github.com/yeshwanthlm

• Ensure CORS is enabled for API Gateway to allow cross-origin requests.
• Use CloudWatch Logs for debugging any issues with the Lambda function.