ISO 639 Language Codes
JSON →python-iso639 provides a comprehensive and easy-to-use interface to ISO 639 language codes, including 639-1, 639-2, and 639-3, along with their names and associated information. It is actively maintained with frequent updates to the underlying ISO 639 data from SIL. The current version is 2026.1.31.
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API endpoints
full doc /v1/registry/python-iso639
compatibility /v1/registry/python-iso639/compatibility