Hi @brewoutlay, I am very sorry you’re having trouble!
In general, I think you can even leave out the final line and should be good, seeing you’re installing the modules globally anyway.
I just tested the below Dockerfile:
FROM n8nio/n8n:1.1.1
USER root
RUN npm install -g hello-world-npm
This works fine in the Code node:
Seeing you your n8n instance doesn’t start, perhaps you can share your server log to see which error exactly it is throwing?