update: as of (oct 8, 2014), npm's offline install commands are not working for me. Urn supports npm's old and new cache formats; so have at it and enjoy your offline-coding time :)

note: consider using npm install --no-registry or npm install -N instead of this module. npm will get all the details right (e.g. binary building, preinstall scripts, etc). As long as you are using a version after v0.10.19, it will be very fast :) [issue link][1] [1]:https://github.com/isaacs/npm/issues/1738#issuecomment-26885594

urn installs npm packages from your npm cache. Unless you've used npm cache clean, you will be able to install ANY package you've ever installed.

Usage:

urn --help or urn -h

Usage:
  urn install underscore
  urn i underscore
  urn underscore
  urn underscore -s # save underscore as dependency in package.json
  urn underscore -S # same as above

• Binary packages will not be built.
• No good way to download the whole npm repo, other than npm install hoarders update: hoarders has been removed from npm.