JWT Decoder & Inspector

Our JWT Decoder is an essential developer tool for inspecting JSON Web Tokens used in modern authentication, API authorization, and stateless web applications. A standard JWT consists of three parts: a Header (algorithm and token type), a Payload (claims like user ID, roles, and expiration dates), and a Signature. Often, developers need to quickly view the decoded payload to debug login issues or verify expiration times.With this tool, you can instantly decode Base64Url encoded JWTs directly in your browser. Since all decoding happens locally via JavaScript on your machine, your sensitive token data is never transmitted to our servers, ensuring maximum privacy and security. You can easily view the JSON structure of both the header and payload, check standard claims (like `iss`, `sub`, `exp`, `iat`), and format the output for readability.Whether you are building OAuth2 flows, troubleshooting Next.js Auth, testing API endpoints, or working with OpenID Connect, this fast, free, and secure JWT debugger streamlines your development workflow.