How to Generate PDF in node.js

I want to generate a module which will generate PDF by taking input as my Invoice and that PDF file is send to clients mail id automatic. In 1st step i got some code and try to generate PDF. That code is working fin and i am able to generate the PDF. but i am not able to open the file.

for code i use this link:http://github.com/marak/pdf.js/

Install http://phantomjs.org/ and the install the phantom node module https://github.com/amir20/phantomjs-node

Here is an example of rendering a pdf

var phantom = require('phantom');

phantom.create().then(function(ph) {
    ph.createPage().then(function(page) {
        page.open("http://www.google.com").then(function(status) {
            page.render('google.pdf').then(function() {
                console.log('Page Rendered');
                ph.exit();
            });
        });
    });
});