AWS Signature V4 Express Middleware

aws4-express is an Express middleware library designed for validating AWS Signature Version 4 (SigV4) authenticated requests. It enables Express applications to act as SigV4-secured endpoints, mimicking AWS service behavior without requiring an actual AWS backend for authentication. The current stable version is 0.14.1, and the project demonstrates an active release cadence, frequently updating to support newer Node.js versions (currently >=20) and incorporating security enhancements. Its primary function is to abstract the complexities of SigV4 verification, providing an `awsVerify` middleware that integrates with Express's request lifecycle, notably requiring careful handling of the raw request body for accurate signature calculation. It is actively maintained with regular updates and security audits.