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JWT Debugger

Decode and verify JSON Web Tokens instantly and securely.

Header


                    

                    

                        
Payload

                        

                    

                    

                        
Signature

                        

                    

                    
Enter a token to begin

                

            

        

    


    

        
How to Debug a JWT

        

            
1. Paste Token
Paste your full JWT into the 'Encoded Token' field. The header and payload will be decoded instantly.

            
2. Add Key
To verify the signature, paste your secret or PEM-encoded public key into the second field.

            
3. Check Status
The tool will immediately attempt to verify the signature and display whether it's valid, invalid, or expired.

        

    

    
    

        
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Frequently Asked Questions

        

            
What is a JWT (JSON Web Token)?
A JWT is a compact, URL-safe means of representing claims to be transferred between two parties. The claims are encoded as a JSON object that is used as the payload of a JSON Web Signature (JWS) structure, enabling the claims to be digitally signed or integrity protected. It consists of three parts separated by dots: Header, Payload, and Signature.

            
Is it safe to paste my JWT and secret key here?
Yes, absolutely. This tool is 100% client-side. All decoding and verification happen in your browser using JavaScript. Your token and secret key are never sent to our servers, ensuring your sensitive data remains completely private and secure on your own computer.