The **diff‑arrays‑of‑objects** package provides a small Node.js utility to compare two arrays of objects by a unique key (default `id`). It returns four lists—added, removed, updated and unchanged objects—and lets callers customize how updated items are reported (first version, second version, both, or both with a deep‑diff payload). It’s useful for developers who need to detect and detail changes between JSON‑like collections, such as syncing data sets or generating change logs.