EscherJS

EscherJS is a JavaScript implementation of the Escher HTTP request signing algorithm, based on Amazon's AWS Signature Version 4 but generalized and extended. Version 4.0.2 (stable, released 2023) supports Node >=16 and is ESM-only. It provides both client and server-side signing and validation of HTTP requests. Key differentiators: it's the reference JS library for the Escher auth protocol, used in production by multiple companies. The library has a history of breaking changes (v2, v3, v4) with updated minimum Node versions and URL encoding fixes.