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JWT Generator Online

Generate JWT tokens online with custom headers and claims. Supports HS256, HS512, RS256, RS512, PS256 for API testing and development.

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

This JWT Generator runs completely in your browser and does not transmit secrets or private keys. It is commonly used to create JWTs for testing authentication, authorization, and API security workflows.

  • 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.

{{ decoded.raw.header }} . {{ decoded.raw.payload }} . {{ decoded.raw.signature }}
Header Copy 

                                                    


                                                    

                                                        

                                                            Payload
                                                            Copy
                                                        

                                                        

                                                    


                                                    

                                                        
Signature

                                                        
                                                        

                                                    

                                                


                                                
                                                
Header Validation

                                                
    
                                                    
  • 
                                                        {{ h.message }}
                                                    
    • 
                                                


                                                
                                                
Claim Validation

                                                
    
                                                    
  • 

                                                            
                                                            {{ c.label }}
                                                            ({{ c.claim }})
                                                            — {{ c.message }}
                                                          

                                                        
                                                            {{ c.detail }}
                                                          
                                                    
    • 
                                                


                                            


                                            

                                                

                                                    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
                                                    

                                                


                                                
                                                

                                                    

                                                        
                                                        
                                                    

                                                    

                                                        
                                                        
                                                    

                                                


                                                
                                                
    
                                                    
  • 
                                                        {{ v.message }}
                                                    
    • 
                                                

                                            


                                        

                                    

                                


                                

                                

                                    
                                    
                                    
                                    
                                

                            

                            

                                
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.
    • 
                                

                                
Frequently Asked Questions

                                
What is a JWT generator?

                                

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


                                
Which algorithms are supported for JWT generation?

                                

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


                                
Can I generate JWTs for testing purposes?

                                

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


                                
Is it safe to generate JWTs online?

                                

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

                                
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
                                    
    • 
                                


                                

                                    
Support This Free Tool!


                                    
I build these tools to give you fast, secure, privacy-friendly utilities—free and
                                        signup-free.

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

                                    

                                        
                                        

                                            
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Thank you for helping this tool thrive!

                                

                            

                        

                    

                    
References

                    
                

                

                
                
            

            

                


                    

                        

                            
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