Mega Dev Tools

JWT Debugger & Decoder

Decode and inspect the header and payload of any JSON Web Token.

Encoded Source
Safe Local Decoding
Internal Metadata
TokenTypeJWT
ExpirationNo Expiry

Decoding is purely informational. Signature verification is not performed in this browser-only view.

Decoded Output

Header

Algorithm & Token Type
/* Token header will appear here */

Payload

Data (Claims)
/* Claims data will appear here */

Signature

HMAC / RSA Verification
/* Signature segment */
Alg / Claims0
Cipher Size0B