BuiltItDev

什麼是 BuiltItDev？

BuiltItDev is a collection of 39 developer tools that run entirely in your browser. JSON formatter, Base64, regex tester, JWT decoder, hash generator, color converter, markdown previewer, URL encoder and more. Everything is client-side — your data never leaves your machine. No sign-up required. No paywalls. Just open the tool and use it. Built with Next.js, TypeScript, fully static. Each tool has its own URL so you can bookmark exactly what you need.