About DevFormatLab

DevFormatLab is a developer-first toolkit centered on one job: making data easy to read, write and move between formats. JSON, YAML, CSV, XML and regular expressions — all handled instantly inside your browser.

Every tool is designed around three principles: privacy (browser-only, no upload), speed (instant, no network round-trip) and clarity (minimal, distraction-free UI).

We pay special attention to real-world edge cases — UTF-8 ⇄ Shift-JIS conversion, mojibake detection, multi-row CSV cleanup and locale-aware date / timestamp handling — because the painful parts are exactly what makes a toolkit worth using.

The site is built with Next.js 14, TypeScript and Tailwind CSS, and statically generated for maximum performance.