In Node.js, what is the equivalent of Python's pip freeze

Question

What is the equivalent of Python's pip freeze to create a snapshot list of all the npm modules being used and their current versions? And Python's pip install -r /path/to/requirements.txt so the environment can be reproduced.

On a side note, Meteor.js automatically tracks all packages in .meteor/packages.json and ensures those dependencies whenever a change is made to that file, so I believe it can be done on Node.js.

Answer 1

npm shrinkwrap should do it. here