HTTP_USER_AGENT / Node.js - javascript

I have a little web site working with Node.js, and I need to do some tuning for mobiles.
For this I would like to access the HTTP_USER_AGENT. How can I do that?
I have read a few things on the net, but didn't come to a working solution at this point.
One of the thing I went through is this https://www.npmjs.com/package/useragent.
But as soon as I start, adding this to my code:
var useragent = require('useragent');
I get this error when looking at the site:
Application error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details.
The log says:
Error: Cannot find module 'useragent'
I must obviously not be doing the right thing or doing it wrong.
Any suggestion will be much appreciated.

Did you installed your package first ?
npm install --save useragent
Regards

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