JWT is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It consists of three parts: Header, Payload, and Signature, separated by dots (.). The Header contains the token type and signing algorithm, the Payload contains claims, and the Signature is used to verify the message's integrity. JWTs are commonly used for authentication and information exchange, featuring self-containment, compactness, and URL safety. This tool supports HS256/HS384/HS512 symmetric encryption algorithms.