JWT Generator Online

Created by:Dhiraj Reviewed by:Devglan Team

Generate a JSON Web Token (JWT) online by defining custom header values, payload claims, and signing algorithms. Supported JWT algorithms: HS256, HS384, HS512, RS256, RS512, PS256

Explore our other set of JWT related tools: JWT Token Decoder, JWT Token Validator.

  • HMAC (Shared Secret)
  • RSA (Public / Private Key)

Generate JWT Token Online

100% Client-Side Execution. No Data Sent to Server Secure

Generate a signed JWT using custom headers and claims for testing authentication and authorization flows.

HMAC secret is only applicable for HS256 / HS384 / HS512
Required to generate tokens using RS* and PS* algorithms
Optional — derived from private key, used for verification

Decode a JSON Web Token to instantly view its header and payload. No secret or private key is required.

. .
Header Copy 

                                                        


                                                        

                                                            

                                                                Payload
                                                                Copy
                                                            

                                                            

                                                        


                                                        

                                                            
Signature

                                                            
                                                        

                                                        

                                                    


                                                    
                                                    
Header
                                                        Validation

                                                    
    
                                                        
                                                    


                                                    
                                                    
Claim Validation

                                                    
    
                                                        
                                                    


                                                


                                                

                                                    

                                                        Validate a JWT by verifying its signature and checking
                                                        registered
                                                        claims such as expiration and not-before.
                                                    

                                                    
                                                    
                                                    

                                                        

                                                            
                                                            
                                                        

                                                        
                                                    

                                                    

                                                        

                                                            

                                                            

                                                                
                                                            

                                                        


                                                        
                                                        

                                                            Required for RS* and PS* signature verification
                                                        

                                                    


                                                    

                                                        
                                                        

                                                    
                                                      ✔ Verified
                                                    
                                                        

                                                    


                                                    
                                                    

                                                        
                                                        
                                                        

                                                            Algorithm is detected from the JWT header
                                                        

                                                    


                                                    
                                                    

                                                        

                                                            
                                                            
                                                        

                                                        

                                                            
                                                            
                                                        

                                                    


                                                    
                                                    
    
                                                        
                                                    

                                                


                                            

                                        

                                    


                                    

                                    

                                        
                                        
                                        
                                    

                                

                                

                                    
All processing happens locally using the
                                        browser’s
                                        WebCrypto API.
                                        Your tokens and keys are never sent to any server, making this tool safe for
                                        debugging
                                        production JWTs.

                                    
What Is a JSON Web Token?

                                    

                                        A JSON Web Token (JWT) is a compact, URL-safe means of
                                        representing
                                        claims to be transferred between two parties.
                                        It consists of three parts: Header, Payload
                                        (claims), and Signature.
                                    

                                    
JWTs are widely used for API authentication, single
                                        sign-on
                                        (SSO), and securely transmitting
                                        information between client and server. Learn more at JWT.io
                                        and
                                        Auth0's
                                            JWT guide. You can also follow this
                                        tutorial to implement the JWT
                                            based auth mechanism in spring boot.
                                    

                                    
What Is JWT Generation?


                                    

                                        JWT generation is the process of creating a token by defining its header,
                                        payload,
                                        and cryptographic signature. Generated tokens are commonly used for testing
                                        secured
                                        APIs and identity flows.
                                    

                                    
How JWT Tokens Are Generated


                                    

                                        A JWT is generated by encoding the header and payload, then signing them using a
                                        cryptographic algorithm such as HMAC or RSA.
                                    


                                    

                                        Generated tokens can be inspected using a
                                        JWT decoder
                                        and validated using a
                                        JWT validator.
                                    

                                    
When Should You Use a JWT Generator?


                                    
    
                                        
  • Test authentication and authorization logic
    • 
                                        
  • Simulate tokens issued by identity providers
    • 
                                        
  • Debug token-based API security
    • 
                                        
  • Learn JWT structure and signing algorithms
    • 
                                    

                                    
Is JWT Generation Secure?


                                    

                                        JWT generation is secure when keys are handled responsibly. This tool performs
                                        token
                                        generation entirely in the browser and does not transmit sensitive data
                                        externally.
                                    


                                    

                                        Use secure cryptographic algorithms and protect private keys generated using
                                        RSA or
                                        ECC or generate HMAC
                                        secret using
                                        HMAC Generator.
                                    

                                    
Security best-practice hints

                                    
    
                                        
  • Prefer RS256/RS512 or PS256 over HMAC when
                                            possible, especially for public-facing APIs.
                                        
    • 
                                        
  • Keep your private key secure and never expose it in client-side code.
    • 
                                        
  • Use short-lived tokens and validate exp,
                                            nbf, and iat claims.
                                        
    • 
                                    

                                    
Use Cases


                                    

                                        A JWT Generator is primarily used to create signed tokens for testing
                                        authentication
                                        and authorization workflows.
                                    


                                    
    
                                        
  • Generate JWTs for API testing
    • 
                                        
  • Simulate tokens issued by identity providers
    • 
                                        
  • Test role-based access control
    • 
                                        
  • Learn how JWT claims and signatures work
    • 
                                    

                                    
Tool Capabilities


                                    
    
                                        
  • Generates signed JWTs using supported algorithms
    • 
                                        
  • Allows custom header and payload configuration
    • 
                                        
  • Supports registered and private claims
    • 
                                        
  • Runs securely in the browser without sending keys
    • 
                                    

                                    
Key Terminologies


                                    
    
                                        
  • Signing Algorithm – Method used to generate JWT signatures
                                        
    • 
                                        
  • Claims – Statements embedded within the JWT payload
    • 
                                        
  • Secret Key – Key used for symmetric signing algorithms
    • 
                                        
  • Public / Private Key – Keys used for asymmetric JWT signing
                                        
    • 
                                    

                                    
Frequently Asked Questions (FAQ)


                                    

                                        
                                        

                                            A JWT generator creates signed JSON Web Tokens using custom claims and
                                            cryptographic
                                            signing algorithms.
                                        

                                    


                                    

                                        
                                        

                                            Common algorithms include HMAC, RSA, and ECC-based signing methods.
                                        

                                    


                                    

                                        
                                        

                                            Yes. JWT generators are commonly used to test authentication and
                                            authorization flows.
                                        

                                    


                                    

                                        
                                        

                                            It is safe when generation occurs locally. This tool runs entirely in the
                                            browser
                                            and does not send data to any server.
                                        

                                    

                                    

                                        
Support This Free Tool!


                                        
                                        
Buying me a coffee helps keep the project running and
                                            supports
                                            new features.

                                        


                                            

                                                
                                                cards
                                                
 Powered by paypal
                                                

                                            

                                        

                                        
Thank you for helping this tool thrive!

                                    

                                    

                                        

                                            Help Others Find This
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                            
                                                
                                        

                                    

                                

                            

                        

                        
References