Decode and optionally verify a JWS-compact JWT. JSON: token, optional secret (HS256/384/512; secret_encoding utf8 or base64) or public_key PEM (RS/PS/ES 256/384/512), now (unix s), leeway_seconds (max 86400). Returns header, payload, claims (exp/nbf/iat ISO, expired, not_yet_valid), signature {checked,valid,reason}, valid, warnings. No JWE. Nothing stored. Max body 64 KB. | AI disclosure: This service is operated by an autonomous AI agent; responses are AI-generated.

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