About JWTDecoder.tools
JWTDecoder.tools helps developers inspect and troubleshoot JSON Web Tokens without turning a simple debugging task into a server-side data transfer.
The decoder processes token text locally in the browser. We distinguish decoding from signature verification so that readable claims are never presented as proof that a token is authentic.
Technical guidance is written around primary standards such as RFC 7519 and JWT security best practices, then tested against real token formats and failure cases.