About

SparkJSON is 10 small developer tools — online JSON formatter, JWT decoder, password generator, and similar — with one constraint: none of them talk to a server. They started as scripts reached for repeatedly while working; this site exists so you don't need a terminal or throwaway snippets for those jobs.

How client-side processing works

The site is Next.js exported as static HTML, CSS, and JavaScript. There is no API route, server action, or database that could receive what you type. Formatting and generation use Web APIs (crypto.getRandomValues, Web Workers, Clipboard) in your browser. Verify it: DevTools → Network, use a tool with real data — no request carries that input.

What this is not

Not an account product, not file sync, not an IDE. It's for one-off tasks that don't justify opening a full app.

Maintenance

Independent, small-scale. Bug reports and tool ideas are welcome — see contact.

Funding

Reserved ad slots pay for hosting. There is no premium tier — what you see is the product.