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JWT Decoder

Instantly view the header and payload of a JWT without sending tokens to a server.

Free foreverNo uploadsNo account
Encoded JWT string
Header
Payload (claims)
Suggested next steps

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01 · Real-world fits

Common use cases

  • Debugging authentication headers in web applications
  • Checking token expiration (`exp`) or issued-at (`iat`) dates
  • Verifying the scopes and claims granted to a specific user session
02 · The honest pitch

Why JWT Decoder?

Many developers paste sensitive production JWTs into random online decoders, unwittingly exposing user data or active session tokens to third-party logs. Our JWT decoder runs 100% client-side, ensuring your tokens cannot be intercepted.

03 · Edge cases

Frequently asked questions

No. Signature verification requires your private secret key, which you should never paste into a web tool. This tool strictly decodes the Base64 payload for inspection.