Developer builds privacy-first browser toolbox with JWT decoder, JSON formatter and more

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A developer has launched tools.merrt.com.tr, a collection of over 20 developer utilities that run entirely in the browser with no backend or data collection. The platform includes tools such as a JWT decoder with signature verification, a JSON formatter, diff checker, hash generator, and several data converters. Because nothing is sent to a server, users can work with sensitive tokens or API responses without privacy concerns, and the site also functions offline as a Progressive Web App. Built as a React single-page application, the project required a custom prerender step to generate static HTML per route, solving common SEO limitations of SPAs. The source code is publicly available on GitHub, and the developer is inviting feedback on additional tools or bugs.

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