var helvetica = pdf.font('Helvetica');
var title = "Edit the code on the left. Go ahead. Do it.";
var page = pdf.addPage();
page.setFontAndSize(helvetica, 24);
var tw = page.textWidth(title);
page.beginText();
page.moveTextPos( (page.width()-tw)/2, page.height()/2 );
page.showText(title);
page.endText();
// For more examples, see https://manuels.github.com/hpdf.js/