1#Syntex
2npm install packagename -g
3
4#example
5npm install express -g
6

1flag for npm install ... installs a module globally on your system.
2good for tools, utilities you will use in more than one project
3--global flag when running the install command
4it puts the module in a system directory
5rather than locally (to the current directory).

1npm install package-name
2
3To save as a dependency:
4npm install package-name --save