Middler is a tiny, embeddable middleware router for Node.js that lets you attach a full‑featured, Express‑style request‑handling chain to any HTTP server or to another middleware stack (e.g., Connect or Express). It’s aimed at developers who need a lightweight, chainable router with routing, vhost, weighting and error‑handling capabilities, and who want to package reusable middleware “controllers” that can be plugged into existing servers.