Middy is a middleware engine for AWS Lambda that runs on Node.js.
The tool addresses the challenge of keeping Lambda handlers clean and maintainable by separating cross-cutting concerns from business logic. It works by wrapping your handler function with a chain of middleware that execute before and after your core logic, allowing you to attach reusable steps for parsing, validation, authentication, observability, error handling, and AWS service integration without cluttering your handler code.
Middy suits teams building serverless applications on AWS Lambda who want to reduce boilerplate and share common patterns across multiple handlers. It works well for projects where you need consistent request processing, response formatting, or error handling across your Lambda functions. The tool is particularly valuable if you're managing multiple handlers and want to avoid duplicating logic like input validation, logging, or AWS SDK initialization.
The project maintains comprehensive automated testing including unit tests, dynamic application security testing, performance testing, static application security testing, and linting. The codebase achieves complete code coverage and follows conventional commit standards. Security practices include provenance verification and SLSA level 3 compliance.
