You can also use WebStorm or IntelliJ as mentioned on the Debugging Wiki Page. Other IDEs might work with a similar configuration.
I tried starting it with the debugger, but I get as far as debugging geddy. You can give it a go. The signal is only needed if the process was started without the debugger, however you can run the following command:
node --debug /usr/local/lib/node_modules/geddy/bin/cli.js
or
node --debug-brk /usr/local/lib/node_modules/geddy/bin/cli.js
I also found node-inspector-windows looks promising, but I've not tried it.