Hi, me and a friend made a module for this a couple weeks ago https://github.com/ZeusJunior/node-tf2-backpack.
Figuring out if something was craftable or tradable was a bit of a massive bitch but it (among other attributes) was tested with a dataset of ~230.000 items from give or take 300 trading bots, cross referenced to the steam api. I'm sure there's probably some cases missing like store preview items that we haven't tested but it covers the majority.
Came accross another thread of yours just now (there are some comments about that here) and then found this one.
Hope it helps?
