DevTools – 50+ developer tools AIO
JSON, Regex, JWT, Markdown and more — all in one toolbox
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Downy Tran

DevTools – 50+ developer tools AIO - JSON, Regex, JWT, Markdown and more — all in one toolbox

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DevTools is a free browser-based toolbox for everyday developer tasks. Format JSON, test regex, decode JWT, generate UUID, preview Markdown or Mermaid, visualize SQL schemas, and more. Everything runs locally in your browser. No login. No data collection.

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Downy Tran
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Hi everyone 👋 I'm the maker of DevTools. I built this toolbox because I was constantly opening multiple websites for small tasks like JSON formatting, regex testing, and JWT decoding. My goal was to create a simple place where developers can access many useful tools without login or data collection. Everything runs directly in the browser and is designed to be fast and simple. I'd love to hear: • what tools you use most often • what tools are missing • any UX improvements you’d like to see Thanks for checking it out!