JSON Knife - 30 free developer tools. No ads, no signup, no BS.

I built JSON Knife because I was tired of Googling "json formatter online" and landing on sites with 47 ads, three cookie popups, and a layout from 2008. So I made the tool I wanted: fast, dark, clean. Then I kept adding more — regex, SQL, cron, Docker Compose, Mermaid diagrams, JWT decode, Tailwind migration. It's now 30 tools and I keep adding more. Everything runs client-side in your browser. Your data never hits a server. No signup, no tracking, no monetisation tricks. Just tools that work. Built with Svelte 5 and hosted on Cloudflare Pages, so it loads instantly anywhere in the world. The tools I use most: JSON Formatter (obvious), Cron Generator (I can never remember cron syntax), and the Tailwind v3→v4 migrator (saved me hours on a recent project). Would love to hear which tools you'd find useful and what's missing. I'm adding new ones based on what developers actually need.