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DevToys

A Swiss Army knife for developers on Windows. JSON formatter, regex tester, hash generator, and 30+ tools.

Windows Open Source Dev Tools
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DevToys is a free, open-source collection of developer utilities in one app. JSON/YAML formatter and validator, regex tester, hash generator, JWT decoder, UUID generator, text diff, image converter, and 25+ more tools. All offline — no data leaves your machine. Think of it as the Windows equivalent of Boop or CyberChef. Saves you from opening a dozen browser tabs for one-off dev tasks. Free and actively maintained.