JSON Web Tokens (JWTs) are a popular authentication method used in modern web applications, but debugging issues can be challenging. To diagnose problems with JWTs, it's essential to first check if the token looks plausible and then use specialized tools like jwt.io to inspect its contents. The tool provides detailed information about the token's header, payload, and signature, helping developers identify potential issues. Sometimes, the problem may not be with the JWT itself but rather with the application or configuration. In such cases, generating a new token, creating a new application, or regenerating keys can help resolve the issue. Debugging is a skill that requires patience and persistence, and this post aims to provide valuable insights and techniques for troubleshooting JWT-related problems.