Hash sha256, sha512, sha1 or md5, HMAC, JWT decode (header, payload, expiry, optional HS256 check), UUID v4, base64 encode and decode, URL parse, time zone convert and unix to ISO: one deterministic op per call. Use this when an agent needs a verifiable transform without shipping its own library. Pure Node, no upstream, no model inference, nothing stored, JSON out. Free sample at /api/dev-utils/sample.

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