Tools4.fun
JWT Debugger
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JWT Debugger
Enter your JWT Token:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyLCJleHAiOjE2NTQzMjE2MDAsImFkbWluIjp0cnVlLCJlbWFpbCI6ImpvaG5AZXhhbXBsZS5jb20ifQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
Decode JWT
Clear
Load Sample
HEADER
Algorithm & Token Type
PAYLOAD
Claims Data
SIGNATURE
Verification
Header
// Header will appear here
Payload
// Payload will appear here
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How to Use JWT Debugger
Decode JWT
Paste your JWT token into the input field
Click the
Decode JWT
button
View the decoded header and payload sections
Use
Load Sample
to see an example
About JWT
JWT = JSON Web Token
Used for secure data transmission
Consists of Header, Payload, and Signature
Commonly used for authentication
JWT Structure
Header
: Algorithm and token type
Payload
: Claims and user data
Signature
: Verifies token integrity
Each part is Base64Url encoded
Tips
JWTs are not encrypted by default
Never put sensitive data in JWT payload
Check expiration (exp) and issued at (iat) claims
Validate signature for security
