Only administrators are able to install software system wide. Users are allowed however to install software into their home, scratch, or data directories for individual use on any of the machines. You can install npm packages without sudo (in your home directory) by making some simple changes to the npm configuration.

This blog post sums it up nicely:

  https://medium.com/@sifium/using-npm-install-without-sudo-2de6f8a9e1a3

And here's the information directory from npm:

  https://docs.npmjs.com/getting-started/fixing-npm-permissions

In addition you can always put in a request to have a software package installed by sending an e-mail to helpdesk@cims.nyu.edu