[iamcreasy]

This looks great! I'll surely come back to it later.

How much of the process can be pushed to server side? (Sorry, I don't speak JS.)

[tip_of_the_hat]

Pretty much all of it! The JS in this walkthrough is all server-side. I tried to keep the JS itself simple so that someone unfamiliar with the language could have an easy time following the code.

[Atotalnoob]

It’s all server side. It’s written using express which is a web server framework built on top of nodejs