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JWT Decoder Advanced

Paste any JWT token to decode its header, payload, and signature. View algorithm info, expiration claims, and token validity.

JWT Decoder
Paste JWT Token
Header 
 
Payload 
 
Signature 
 
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How to use JWT Decoder Advanced
  1. Paste your JWT token into the input field.
  2. View the decoded header and payload.
  3. Check expiration and other claims.
  4. Optionally enter a secret to verify the signature.
What is JWT Decoder Advanced?
A JWT (JSON Web Token) decoder parses the three parts of a JWT token: header, payload, and signature. It displays the algorithm used, decoded claims, expiration time, and other standard registered claims.
This advanced decoder also shows algorithm details, token structure breakdown, and helps debug common JWT issues like expired tokens, invalid signatures, and malformed tokens.
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FAQ
What JWT algorithms are supported?
The decoder supports HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, ES512, and PS256, PS384, PS512.
Is my token sent to a server?
No — decoding happens entirely in your browser. Token verification with a secret is also done client-side.
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