I am looking at using http://code.google.com/p/libphonenumber/ for a well-established project. Today the project does not use Google\'s libraries for JavaScript, favoring jQ
I've got a custom build (currently 220KB) that I use for my International Telephone Input plugin, with plenty of helper functions exposed. Read the source for details.
Here are two implementations of Google libphonenumber in JavaScript that have zero dependencies and are implemented in a single file. I've used Nathan Hammond's version without issue but it is not on NPM. Rui Marinho's version is on NPM.
You can also use my lib. https://github.com/Gilshallem/phoneparser
Its only got one method but you can do a lot with it
parsePhone("12025550104");
result: { countryCode:1, areaCode:202, number:5550104, countryISOCode:"US" }
I just spent 2 days figuring this out. For now, anyway, you can download a minified version of libphonenumber-js from here
drop it in place, with the usual
<script type="text/javascript" language="javascript" src="/static/js/libphonenumber-js.min.js"></script>
and get busy coding!
<script>
$(".phone-format").keyup(function () {
var val_old = $(this).val();
var newString = new libphonenumber.AsYouType('US').input(val_old);
$(this).focus().val('').val(newString);
});
</script>