version: grunt-cli v0.1.8


1. Install node-inspector globally (-g)

    npm install -g node-inspector

2. Add debugger statements to your code

3. Run your grunt task in debug mode

    node --debug-brk $(which grunt) <your-grunt-task>   

    --debug-brk stops on first line
    
    in theory you can use just --debug instead of --debug-brk
    which will stop at your first debugger statement 
    but i haven't had luck w it    

4. Run node inspector

    node-inspector 

5. Use your browser console to step thru your code

    http://0.0.0.0:8080/debug?port=5858

Note: when you inspect variables from the console, can take a while for values to show up


Ref:
https://github.com/dannycoates/node-inspector
http://stackoverflow.com/questions/11171013/using-node-inspector-with-grunt-tasks