common node modules for multiple sub angular modules

we have multiple angular modules reside under one root folder. Currently every module has its own grunt file and can be deployed or run(serve) own. But we do build and deploy them together.

So we have one grunt file in the root folder and that will trigger all the sub module grunt files. The problem here is, If i have 10 modules under root and I ended up doing npm install 10 times. Instead of this, can I install npm modules once and reference them in sub modules?

root

|--------module1

|

|--------module2

|

|--------modules3