PhantomJS /dev/stdin -> /dev/stdout

pdf.js

var page = require('webpage').create(),
    system = require('system'),
    fs = require('fs');

    var input = system.stdin.read();

    page.viewportSize = {
        width: 1280,
        height: 1000
    };

    page.paperSize = {
        format: 'A4',
        margin: '20px'
    };

    page.onLoadFinished = function(status) {
        page.render('/dev/stdout', {format: 'pdf'});
        phantom.exit(0);
    };

    page.setContent(input, 'http://localhost');