Thanks, Danielo & Mark: Of course! Don't know what I was thinking -- using the TW save button is correct. Solved the problems.
Danielo: I am using node.js to learn it, and this project is just a demo to see if I can figure it out.
Josiah: Not sure if your comment was tongue-in-cheek or not, but I'll take it seriously, because it does resonate. You noted that node.js will "corrupt my essence." To be honest, I agree: moving from the file-based to the node.js version of TW radically changes the type of TW user I am. I think it renders me less sensitive to the struggles of everyday TW users, which is not helpful for me as a teacher. However, my projects are getting sufficiently complex and large that the file-based system doesn't work for me. So, I think I'll have to live with the "corrupted essence" of myself as a TW user :).
//steve.