RecommendationRaccoon is an NPM module that provides a collaborative‑filtering recommendation engine built on Node.js and Redis. It records simple like/dislike actions (by user and item IDs) and uses the Jaccard similarity coefficient plus a k‑nearest‑neighbors algorithm to generate personalized item recommendations, as well as global rating statistics. It’s aimed at developers who have a user base and a catalog of products, movies, or other items and want to add fast, Redis‑backed recommendation functionality to their applications.