I invite to take a look at the just released Yubikey Handbook (https://github.com/ruimarinho/yubikey-handbook), an open source book on the many different Yubikey use cases and stories.
I have created a node package a couple of months ago which I regularly keep up-to-date with the latest upstream changes. It exports everything that the javascript version of libphonenumber offers. You can check it at http://seegno.github.io/google-libphonenumber/.