DevNest - 8 private developer tools that never leave your browser

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JSON formatter, JWT decoder, regex tester, Base64 & URL encoders, hash and UUID generators, and a timestamp converter โ€” all running 100% in your browser. Nothing you paste is uploaded or stored. Live results as you type, dark mode, no sign-up.

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Hey Product Hunt ๐Ÿ‘‹ I'm the maker of DevNest. I kept pasting JWTs, API responses and config files into random online tools while debugging โ€” and realised I had no idea whether any of them sent that data to a server. Some of those tokens were live sessions. So I built DevNest: eight tools I use every week, all running entirely in the browser. There's no backend that could receive your data. A few things I'm proud of: ๐Ÿ” JWT Decoder shows expiry as "expires in 2 hours / expired 3 days ago" โ€” and clearly warns that decoding isn't verifying ๐Ÿงช Regex Tester runs in a Web Worker with a timeout, so a catastrophic pattern like (a+)+$ can't freeze your tab #๏ธโƒฃ Hash Generator does MD5 โ†’ SHA-512 for text or files, with HMAC and a "compare with expected checksum" box ๐Ÿงพ JSON Formatter tells you the exact line and column of an error, with a "jump to error" button It's free, needs no sign-up, and works on mobile. What tool should I add next? I'm considering JSON โ†” CSV, a cron expression explainer and a diff checker โ€” I'd love to hear what you use most.