/v3/languages endpoint, which returns language support per resource along with feature availability (e.g. formality, glossary, auto-detection). The legacy /v2/languages endpoint is also available but deprecated.
API Supported Languages
Style rules are supported for the following target languages:
ar, bg, cs, da, de, el, en, es, et, fi, fr, he, hu, id, it, ja, ko, lt, lv, nb, nl, pl, pt, ro, ru, sk, sl, sv, th, tr, uk, vi, and zh.For more details, see the Style Rules API documentation. Writing style and tone availability for /write/rephrase can also be retrieved via GET /v3/languages?resource=write.