PDF generation using Phantom Js

phantom-pdf.js

            var params = {
                input: outputHtmlFile,
                output: outputPdf
            };

            generatePDF(params, function(err, response) {
                if (err) {
                    callback('Unable to generate PDF');
                } else {
                }
           });   
                  
/**
 * [generatePDF - Generate PDF ]
 * @param  {object}   params   [{input:file,output:file,config:{}}]
 * @param  {Function} callback
 */
function generatePDF(params, callback) {
    var phInstance = null;
    
    phantom.create()
        .then(function(instance) {
            phInstance = instance;
            return instance.createPage();
        })
        .then(function(page) {
            // page.property('viewportSize', {
            //     width: 800,
            //     height: 600
            // });
            page.property('paperSize', {
                format: 'A4',
                orientation: 'landscape',
                margin: 20
            });

            page.property('zoomFactor', 1);

            page.open(params.input)
                .then(function(status) {
                    if (status == 'fail') {
                        phInstance.exit();

                        callback('Unable to generate PDF');
                    } else {
                        page.render(params.output, {
                            format: 'pdf',
                            quality: '100'
                        }).then(function() {
                            page.close();
                            phInstance.exit();

                            callback();
                        });
                    }

                });
        })
        .catch(function(error) {
            phInstance.exit();
            logger.error('phantom', error);

            callback('Unable to generate PDF')
        });
}