launch‑editor is a lightweight Node.js utility that opens a file (optionally at a specific line and column) in the developer’s editor, automatically detecting the appropriate editor from running processes or environment variables. It can be used directly in scripts or via an express‑compatible middleware (`/__open-in-editor`) to enable “open‑in‑editor” links in development servers, supporting a wide range of editors across Linux, macOS, and Windows. The package is aimed at tool‑makers and web developers who need a simple, reliable way to jump from error messages or stack traces into their code editor.