I was building a side project and needed some test credit card numbers. Googled it, landed on a sketchy site with 14 ads. Needed fake addresses too different site, different UI, another set of ads. JSON formatting? Another tab.
Toolpad — 25+ free browser-based developer tools. No signup. No limits.
Fake data generators that actually validate — Luhn-valid credit cards, MOD-97 IBANs, real-TAC IMEIs. JSON & XML formatter, minifier, validator. JSON↔XML, JSON↔CSV, Base64, Hex converters. Everything runs client-side — your data never leaves the browser.
Free REST API included, no key required.
