Osmosis is a fast, lightweight web‑scraping library for Node.js that leverages native libxml C bindings to parse HTML/XML and lets developers compose complex data extraction pipelines with a promise‑like API. It supports CSS3, XPath, Sizzle and Slick selectors, handles cookies, redirects, proxies and form logins, and runs scripts in the DOM without pulling in heavyweight dependencies like jQuery or jsdom—making it ideal for developers who need efficient, low‑memory scraping tools for data‑intensive projects.