About a2zutil.dev

a2zutil.dev collects the utilities developers reach for constantly — formatting a JSON response, untangling a query, converting a string, watching a webhook land — into one uncluttered site that loads instantly and asks nothing of you.

There are no accounts, no usage limits, and no upsells. Open a tool, use it, close the tab.

Every tool except the webhook receiver — the JSON formatter, SQL formatter, string & ID formatter, text transform tool and JSON ↔ CSV converter — runs entirely in your browser using client-side JavaScript. Your input is never transmitted, logged or stored anywhere. The BIN checker is a partial exception: it sends only the first 6-8 digits you enter to a third-party lookup API, directly from your browser.

The webhook receiver is different by necessity: it needs a real server to receive requests from the outside world. Requests delivered to your temporary URL are stored so you can inspect them, and the session expires automatically. Authorization and cookie headers are redacted on arrival, and you should only ever send test events to it.

A JWT decoder, a Unix timestamp converter and a regex tester are the next tools in the queue. The bar for adding one is simple: it should be something a developer needs several times a week, and it should work without an account.