You use npm install & pack
First on a machine that is online you install
$ npm install pm2
Then you pack it up
$ npm pack pm2
That gives you a tar file -- you copy that tar file to your offline machine and install, like
$ npm install pm2-2.2.1.tgz
The above however only create a tarball for the specific module expluding dependencies, and you may still have dependencies that you need to resolve. While you could simply walk through and pack every dependency manually, there is a modules that will automated that for you
$ npm install -g npm-bundle
Then you can do
$ npm-bundle pm2
for the individual packages, or if you have apackage.jsonfor your project
$ npm-bundle
to pack everything in one big tarball
