Developer builds 30 browser-based dev tools to avoid leaking API tokens online

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A developer launched DevTools Kit, a free collection of 30 utilities — including JWT decoders, formatters, converters, and a side-by-side code diff tool — that run entirely in the browser without sending data to any server. The project was motivated by the common but risky practice of pasting sensitive tokens and production data into unknown third-party websites. Every tool operates client-side, meaning it continues to function even when the network connection is disabled. Built with Vue 3 and deployed as static pages on Cloudflare Pages, the toolkit achieves perfect Lighthouse scores for performance, SEO, and best practices. DevTools Kit requires no sign-up, displays no ads, and collects no analytics, and is accessible at devtoolskit.uvercy.com.

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