For KVdb [1], my managed key-value store database, I opted to integrate Lua as a scripting language instead of JavaScript because it felt super lightweight and the syntax is easy to learn in a few hours for even newbies. I'll probably end up adding JavaScript, too, since most developers know it, but there is a simplicity about Lua that I haven't seen in many other somewhat popular languages.

[1] https://kvdb.io/docs/scripting