Free Online Developer Tools
19 dev tools, zero server processing. JSON, Base64—free.
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Free Online Developer Tools - 19 dev tools, zero server processing. JSON, Base64—free.

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DevToolCore is a no-frills collection of 19 browser-based utilities that developers actually use daily. JSON formatter with collapsible tree view, real-time regex tester, Base64/URL encoder-decoder, JWT decoder, UUID generator, timestamp converter, and SEO meta tag analyzer — all running client-side so your data never touches a server. No account, no paywall, no annoying popups. Just open the tab and get stuff done. Built with Spring Boot + Alpine.js.

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Hey PH! Im a solo dev who got tired of bookmarking 10 different tool sites for JSON formatting, regex testing, Base64 encoding, etc. So I built one page that does all of it — and made sure nothing gets sent to a server (everything runs in your browser). Currently at 19 tools, all free, no signup. Would love feedback from fellow devs on what I should add next.