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JWT Decoder
Decode a JWT's header and payload in your browser.
About this tool
The JWT Decoder splits a JSON Web Token and decodes its header and payload so you can inspect the claims — issuer, expiry, subject and more. Decoding happens locally; the signature is not verified.
Frequently asked questions
No. It only decodes the readable parts. Never trust an unverified token for authorization — verify it server-side with the secret/public key.
No — decoding runs entirely in your browser.