JWT decoder tool

We have been using JWT for authentication in various elmah.io services for years. Having access to a good decoder is essential for debugging claims and signature issues, but we often found ourselves hesitant to paste sensitive tokens into random third-party websites.

That’s why we built our own Online JWT Decoder. It’s designed with a “security-first” approach, where all decoding happens locally in your browser. No data ever reaches our servers.

Available for free here: JWT Decoder.