JWT decoder
Read the header and claims of a JSON Web Token.
This tool runs in your browser. Your files and text are not uploaded.
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Decoding does not verify authenticity. Never trust claims from an unverified token.
How to use JWT decoder
- Paste a token.
- Read the header, claims and expiry.
Questions
Does this verify the token?
No. Decoding shows what the token says, not whether it is genuine. Anyone can make a token with any claims; only signature verification with the issuer’s key proves authenticity.
Is my token sent anywhere?
No. Decoding runs in your browser. Still, avoid pasting live production tokens into any website.
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