Its possible to run grunt tasks within WebStorm through external tools. However, is it possible to avail debugging with external tools? By running tasks like grunt se
I just happened to try this in WebStorm 10 today. I'm not sure if it's a new feature but WebStorm have integrated the steps described by @diego so you don't have to perform them manually:
You can set breakpoints etc. in Gruntfile.js
just like you would any other file.