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Developer Tool
JWT Decoder.
Paste a JWT to decode its header and payload with human-readable expiry, and optionally verify an HS256 signature against a shared secret. Runs entirely in your browser — nothing is uploaded. How to use
Load Sample:
Paste an encoded JWT on the left to inspect its decoded header, payload, and claims.
Runs 100% client-side — tokens and secret keys are never transmitted over the internet.