Serverless API Monitoring with AWS SAM: Lambda, API Gateway & CloudWatch Alarms
This example demonstrates how to build a lightweight, serverless API using AWS SAM (Serverless Application Model) while integrating real-time error monitoring and email alerts using CloudWatch Alarms and SNS. This pattern is ideal for production-ready serverless applications that need observability without heavy tooling. Project Structure The project includes the following core components: functions/: Contains the Lambda function that handles HTTP requests: app.mjs: Returns a simple response (e.g., “Hello World”). template.yaml: The SAM template defining resources including: Lambda Function (hello handler) API Gateway (to expose the function via HTTP) CloudWatch Alarm (monitors API 5XX errors) SNS Topic & Subscription (sends email alerts) How It Works This architecture sets up an API and monitors its availability in real time: ...