I made a 100% offline dev toolkit in one HTML file - no dependencies, no ads

I was getting really tired of having to open a lot of different websites just to format my JSON or generate a UUID or test a regex. So I decided to build a single HTML page* that can do all of these things. And it works completely offline.

JSON Formatter / Validator / Minifier – DevUtils can instantly clean up your JSON

Base64 Encoder / Decoder – DevUtils can encode text or decode Base64 strings

UUID v4 Generator – DevUtils can generate a UUID with one click and copy it to your clipboard

Unix Timestamp Converter – DevUtils can convert seconds into a date that you can read easily. And it can also do the opposite