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JWT Decoder & Inspector

Paste a JSON Web Token to instantly decode its header, payload, and inspect claims. Everything runs in your browser.

Examples:

JWT Token


                

            


            
            

                
                
            

        


        
        

        
        

            
                JWT Quick Reference
            
            

                

                    
Structure

                    

                        
Header — Algorithm & token type

                        
Payload — Claims (data)

                        
Signature — Verification hash

                        
header.payload.signature

                    

                

                

                    
Registered Claims

                    

                        
iss Issuer

                        
sub Subject

                        
aud Audience

                        
exp Expiration Time

                        
nbf Not Before

                        
iat Issued At

                        
jti JWT ID

                    

                

                

                    
Common Algorithms

                    

                        
HS256 HMAC + SHA-256

                        
HS384 HMAC + SHA-384

                        
HS512 HMAC + SHA-512

                        
RS256 RSA + SHA-256

                        
ES256 ECDSA + SHA-256

                        
EdDSA Edwards-curve DSA

                    

                

            

        


        
        

            

                
                Runs in your browser
            

            

                
                100% free forever
            

            

                
                No data sent to server
            

        

    













    
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Frequently Asked Questions

    

        
        

            
                Is this JWT decoder free and secure?
                
            
            
Yes, completely free. All decoding happens in your browser — your tokens are never sent to any server.

        

        
        

            
                Can this tool verify JWT signatures?
                
            
            
This tool decodes and inspects JWTs, showing header, payload, and claims. For security, signature verification should be done server-side with your secret key.

        

        
        

            
                What JWT formats are supported?
                
            
            
Standard JSON Web Tokens with three parts (header.payload.signature) using any algorithm (HS256, RS256, ES256, etc.).