The **barycentric** package provides a tiny JavaScript utility that converts a point’s Cartesian coordinates into barycentric (areal) coordinates relative to an arbitrary simplex (e.g., a triangle in 2‑D, tetrahedron in 3‑D, etc.). It is intended for developers—especially those working with geometry, computer graphics, or numerical methods—who need a simple npm‑installable function to compute these coordinates in Node or browser environments.