About JSONKitt

JSONKitt is a JSON workbench: formatter, validator, tree viewer, and a set of converters (CSV, YAML, XML, TypeScript, Pydantic, Java/Kotlin). It exists so you can inspect a payload without pasting it into a random server-side tool.

Every transform runs in your browser with the JavaScript engine you already have. There is no account, no database, and no API that receives your JSON. Share links compress data into the URL with lz-string; if you do not want that, do not click Share.

Why it is free

The product is a static Next.js front end. Operating cost is hosting. Ads may appear later (see the privacy policy) so the tools can stay free without a paywall.

Built by developers, for developers

The UI is intentionally dense: indent controls, keyboard shortcuts, exact parse errors, and downloads. Sample data is a realistic checkout API payload, not filler text. If something is wrong, the Contact page sends email from your own mail client.