token JWT Generator
Create and sign JSON Web Tokens (JWT) with HMAC algorithms. All signing happens in your browser.
This tool creates and signs JSON Web Tokens (JWTs) using HS256/384/512 algorithms - useful for testing an API that expects a JWT, learning how JWT structure works, or generating a token for a development/testing environment without setting up a full authentication server.
Frequently asked questions
This tool is best suited for testing, learning, and development purposes - for real production authentication, tokens should be generated and signed server-side using your application's actual secret keys and infrastructure, not a third-party browser tool.
They're the same HMAC-based signing approach using different hash functions (SHA-256, SHA-384, SHA-512) - higher numbers mean a longer, more computationally intensive signature, though HS256 is the most commonly used default across most systems.
Signing happens in your browser, but as a general precaution, use a test/throwaway secret key here rather than a real production secret, especially since JWTs are often used for actual authentication.