Developer builds browser-only dev tools after realizing he kept leaking production JWTs

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A developer has launched a free, browser-based toolkit at devtools-hub-sigma.vercel.app after recognizing a personal habit of pasting sensitive data, including production JWTs, into random online tools. The site offers eight utilities — including a JWT decoder, JSON formatter, Base64 encoder, and cron parser — that run entirely client-side with no backend involved. The developer noted that most free online tools unnecessarily send user-pasted data to remote servers, even though browser APIs like atob() and JSON.parse can handle the work locally. Because no server is in the processing path, there is nothing to log, offering a stronger privacy guarantee than a policy-based promise. The project was built using Next.js, TypeScript, Tailwind, and shadcn/ui, and is deployed on Vercel.

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