TPTElements is a website that helps you develop TPT elements with ease! Featuring a code editor with templates and snippets, and a bunch of references to quickly lookup desired APIs!

In short:

Check out the editor to try editing code.

The editor helps you with code snippets as well as syntax highlighting. I'm in the process of adding API specific highlighting too.

Until then, however, try double-clicking anything in the editor to see a short description of it!