Developer builds client-side JWT decoder to prevent token leaks via online tools

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A developer has warned that many popular online JWT decoder tools forward tokens to remote servers, creating a potential security leak for production credentials. In response, they built a browser-only tool that decodes JWT headers, payloads, and signatures entirely on the client side with no outgoing network requests. The tool also supports Base64, Base64URL, URL encoding, and multiple hashing algorithms including MD5 and SHA variants. It includes live expiration checking and syntax highlighting, and is available at jwt-base64-inspector.vercel.app. The project is accompanied by a dedicated JWT security guide hosted on the same domain.

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