Requires version 2.6.1 or greater. See below if you are using an older version.
To update global packages, type:
npm update -g <package>
For example, to update a packages called jshint, you'd type:
npm update -g jshint
To find out which packages need to be updated, type:
npm outdated -g --depth=0.
To update all global packages, type:
npm update -g.
####If you are using version 2.6.0 or less
For npm versions less than 2.6.1, run this script to update all outdated global packages.