Today I looked at Node Inspector - Node.js Debugger athttps://www.youtube.com/watch?v=AOnK3NVnxL8
I found that it was similar to Debug | Web Tools
edit: a more in-depth tutorial is at: https://www.youtube.com/watch?v=-q1z8BPFItw
In both sources inserting debug code was mentioned. I suppose this is a lot like what I wrote on IRC on December 24th.