feathers-hooks is a middleware plugin for Feathers.js that allows developers to register composable functions when a service method executes, making it easy to decouple authorization, pre- or post-processing, and error handling from service logic. It is designed for developers building applications with Feathers.js who need to add cross-cutting concerns like authentication and data processing to their services in a modular way. The plugin provides a simple API for registering before and after hooks on service methods, enabling cleaner, more maintainable code by separating concerns from core business logic.