Inspecting variables using node’s built-in debugger?

Use repl command ( see third example in docs )

break in hotplate/node_modules/bd/lib/bd.js:133
132 
133   debugger;
134 
135   // Delete the ID and the version since there's no point,
debug> repl
Press Ctrl + C to leave debug repl
> Workspace

Update: bonus question – https://github.com/c4milo/node-webkit-agent