Security Tool

Advanced JWT Debugger.

Professional tool for decoding, verifying, and modifying JSON Web Tokens in real-time. All processing is done 100% in your browser for maximum privacy security.

Encoded Token

Verification & Re-Sign

HMAC-SHA256 Secret (for verifying or signing)

*Modifies payload in the editor before clicking

Local History

No recent tokens

Header ALG: - 

 
  
 
  
 
Payload
 
   
 
  
  
 
 

Signature

 
Waiting for token...
 
 
 
  
 
 
How to Use
 
Quick guide to maximize the Pro JWT Debugger features.
 
 
  
 
1
 
Decode & Debug
 

Paste your JWT token in the input box. The application will automatically decode Header, Payload, and Signature in real-time.

 
  
 
2
 
Edit & Re-Sign
 

Modify the Payload content directly in the editor. Enter your Secret Key, then press Re-Sign to generate a new token with a valid signature.

 
  
 
3
 
Quick Integration
 

Use the Get Integration Code button to copy ready-to-use code snippets (cURL, JS, Python, Go) that include your token.

 
 
  
 
  
 
 
Security & Privacy
 

Unlike other online tools, this application performs all processes (decoding & signing) locally in your browser using Web Crypto API.
              Your token data or Secret Key is never sent to our servers.