title: Fill out pdf fields with Node.js
body: <p>I've looking to fill out a pdf with a form data, but can only find librarys to make new pdfs or my html layouts into a pdf.  I'm looking to simply fill out fields of a pdf.  </p>
  
  <p>I'm wondering two things, when a pdf has fillable fields, how can i read the source to see what those fillable names are, and secondly is there a library to do this?  I've already looked into node-jspdf, but it doesn't do what I am looking for.</p>