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JWT

JWT Decoder

Decode and inspect JSON Web Tokens.

Runs entirely in your browser.

Header (ALGORITHM) 
{
    "alg": "",
    "typ": ""
}
Payload (DATA) 
{}
Signature

                


                

                    
Registered Claims


                    

                        

                            
                                

                                    Claim
                                    Value
                                    Description
                                

                            

                            
                                

                                    
                                        Registered claims will appear here.
                                    
                                

                            
                        

                    

                


            


        


      

        

            This JWT Decoder only reads the token contents. It does not verify the signature or confirm that the token is authentic.
        

    


    

        
Free Online JWT Decoder


        

            This free JWT Decoder allows you to decode and inspect JSON Web Tokens directly in your browser. Paste a JWT token into the input field to view its header, payload, signature, algorithm, and registered claims in a readable format.
        


        

            The tool is useful for developers, API testers, software engineers, security teams, and anyone working with token-based authentication. No installation or external library is required, and the JWT decoding process takes place locally on your device.
        


        
What Is a JWT Decoder?


        

            A JWT Decoder separates a JSON Web Token into its three main components: the header, payload, and signature. The header usually contains the token type and signing algorithm. The payload contains claims and application data, while the final section contains the encoded signature.
        


        

            A standard JSON Web Token normally follows this structure:
            header.payload.signature. Each section is encoded using Base64 URL encoding and separated by a period.
        


        
JWT Header


        

            The JWT header commonly contains the alg claim, which identifies the signing algorithm, and the typ claim, which identifies the token type. Common algorithms include HS256, RS256, ES256, and other supported signing methods.
        


        
JWT Payload and Claims


        

            The JWT payload contains claims. Claims can include user identifiers, issuer information, audience values, issue dates, expiration dates, permissions, roles, and other application-specific data.
        


        

            This JWT Decoder identifies common registered claims, including:
        


        
    
            
  • iss: Issuer
    • 
            
  • sub: Subject
    • 
            
  • aud: Audience
    • 
            
  • exp: Expiration Time
    • 
            
  • nbf: Not Before
    • 
            
  • iat: Issued At
    • 
            
  • jti: JWT ID
    • 
        


        
JWT Decoder Features


        
    
            
  • Decode JWT header and payload data.
    • 
            
  • Display formatted JSON for easier inspection.
    • 
            
  • Show the token signature separately.
    • 
            
  • Identify registered JWT claims automatically.
    • 
            
  • Convert JWT timestamps into readable dates.
    • 
            
  • Copy decoded header and payload data with one click.
    • 
            
  • Change the Copy button to Copied for five seconds.
    • 
            
  • Process tokens locally without sending them to a server.
    • 
        


        
Does This JWT Decoder Verify Signatures?


        

            No. This JWT Decoder displays the data contained in a token, but it does not verify the cryptographic signature. A decoded token should not be considered trusted until the signature, issuer, audience, expiration time, and other security requirements have been validated by the receiving application.
        


        
Why Use This JWT Decoder?


        

            A browser-based JWT Decoder makes it easier to debug authentication problems, inspect API access tokens, review claims, check expiration timestamps, and understand token structure. Since decoding happens in your browser, the token is not intentionally submitted to a remote decoding service.