Middy.js Middleware Engine for AWS Lambda

Middy is a Node.js middleware engine specifically designed for AWS Lambda functions, bringing an Express.js-like middleware pattern to serverless environments. It allows developers to encapsulate common logic such as input parsing, validation, authentication, and error handling into reusable middleware functions, enhancing code modularity and maintainability for Lambda handlers. The current stable version series is 7.x, with recent releases like 7.3.1 focusing on improvements, security fixes, and compatibility. Previously, there was a significant breaking change from the 0.x series to 1.x, and subsequently to the 7.x series, requiring migration for older projects. Middy provides a rich ecosystem of official and third-party middlewares for common Lambda patterns, differentiating itself by its focus on simplicity, performance, and a clear execution lifecycle for `before`, `after`, and `onError` hooks.