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JW

JWT Decoder

Decode JWT header and payload locally

Runs locally in your browser; input is never uploaded
Encoding & Security

Usage

Paste a three-part JWT or Authorization: Bearer text, then run. The shared output only contains formatted Header and Payload JSON. Signature, the no-verification warning and exp/nbf/iat time details appear in diagnostics. This tool decodes but does not verify signatures.

FAQ

  1. 1.

    Does successful decoding mean the JWT is trusted?

    No. Decoding only reads Header and Payload. Trust requires signature verification with a trusted key and claim validation.

  2. 2.

    How are exp, nbf and iat displayed?

    Numeric time claims are converted to readable times in diagnostics and do not pollute the copyable JSON output.

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