Launching today

JSON Knife

Launching today

30 free developer tools. No ads, no signup, no BS.

1 follower

30 free developer tools. No ads, no signup, no BS.

1 follower

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A fast, clean toolkit for developers: JSON formatter, validator, diff, converters, regex tester, SQL formatter, JWT decoder, cron generator, Docker Compose builder, Mermaid editor, Tailwind v3→v4 migrator, and 18 more. Runs entirely in your browser — nothing leaves your machine.

Free

Launch tags:Productivity•Developer Tools

Launch Team / Built With

Migma — Lovable for Email

Lovable for Email

Promoted

Maker

📌

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.

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21h ago