The repository converts the IANA language‑subtag registry (the authoritative BCP 47 list of languages, scripts, regions, etc.) from its original record‑jar format into clean, ready‑to‑use JSON files. It supplies a master `registry.json` plus indexed look‑up tables (e.g., `language.json`, `macrolanguage.json`) for fast access, and is kept up‑to‑date with the official registry. This data package is aimed at developers—especially those building internationalisation or localisation tools—who need programmatic, license‑friendly access to language tag information.