JWT Decoder

All JWT decoding runs locally in your browser; nothing is uploaded.

JWT Decoder

Paste a token to inspect its header, payload, claims, and security notes.

Decoding is not verification

This tool only turns Base64URL-encoded header and payload data back into readable JSON. A server must still verify the signature with a secret or public key before trusting any claim.

JWT Decoder

Decode JWTs locally in your browser, inspect the header, payload, signature segment, expiration time, and common security warnings.

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