jwtdev

  JSON Web Tokens (JWTs) are widely used to support authentication and authorization in web applications, APIs, and distributed systems. However, developers can encounter errors involving expired tokens, invalid signatures, malformed structures, and mismatched claims. A reliable JWT debugging tool helps developers inspect token data, troubleshoot verification failures, and check the cryptographic settings used during validation. JWTdev provides browser-based tools to decode tokens, verify signatures, and generate signed JWTs during development and troubleshooting. Understanding JWT Structure A standard signed JWT consists of three parts: a header, a payload, and a signature. The header identifies the signing algorithm, while the payload contains claims such as the issuer ( iss ), subject ( sub ), audience ( aud ), and expiration time ( exp ). The signature allows the receiving application to check whether the token has been altered. Developers can use an online JWT debugger to in...