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JWT Decoder
Decode a JSON Web Token to inspect its header and payload — algorithm, claims and expiry. Nothing is sent anywhere.
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About the JWT Decoder
Decodes a JSON Web Token to reveal its header and payload — the algorithm, claims and expiry — so you can debug auth without pasting tokens into a risky online service. It runs locally.
What this tool checks
- Decodes the JWT header and payload
- Shows the algorithm and expiry
- Runs in your browser — token never sent
Frequently asked questions
Does it verify the signature?
No — verifying needs the secret/public key. This tool decodes the readable parts for debugging only.
Is it safe to paste a token here?
Decoding happens locally in your browser, but treat any live token as sensitive and rotate it if in doubt.
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