About DevKit

DevKit is a collection of 142 small tools for the everyday chores of software development: converting a Unix timestamp, pretty-printing a JSON response, decoding a JWT, generating a UUID, testing a regular expression, checking a list of email addresses.

The tools run in your browser with JavaScript. What you paste into them is processed on your own device and is not sent to our servers. The exceptions are tools whose whole purpose is a network lookup (What Is My IP, DNS Lookup and the optional MX check in the Email Validator); those contact the public services named on their pages.

The site is free to use and is supported by advertising. If a tool gives a wrong result or you would like a new one, please get in touch.