As developers, we constantly rely on web-based utilities. Need to decode a JWT? Format a massive JSON payload? Generate a quick UUID? We usually just Google it and click the first link. But recently, I experienced a moment of "privacy anxiety." I was about to paste a production JWT containing sensitive claims into a random formatter site. I had no idea who owned the backend or if my token was being logged. I decided to build a suite of tools where developers never have to worry about that again. I built ZeroServer.tools . The "Zero Server" Architecture The core rule for this project was simple: No data leaves the browser. > By keeping everything 100% client-side, the risk of data leakage drops to zero. The Tech Stack Framework: Next.js 15. The App Router makes building a multi-tool dashboard incredibly clean. Styling: Tailwind CSS v4. I created a custom "Obsidian" dark theme that developers are used to seeing in their IDEs. Security: Native Browser APIs.…