The **calculate‑string‑similarity** package is a lightweight Node.js library that computes a percentage similarity between two strings (with optional case‑ and order‑sensitivity) and can also compare one string against an array of candidates, applying thresholds, sorting and limiting the results. It’s aimed at developers who need fast, configurable string‑matching functionality for tasks such as spell‑checking, autocomplete, or any text‑analysis feature in JavaScript applications.