How to change pdf document using js?

Question

JavaScript

There is a ready PDF document, which, as I plan, will change depending on the parameters entered by the user on the site. How can this be done with js? Are there ways not to create a new pdf file, such as through jsPDF and so on, but simply change the contents of an already finished one?

Answer 1

PDF is the final format and is not meant to be edited.
Technically, of course, you can parse and change, but it's not easy and few people need it

Answer 2

1. Make a layout (not a document) where the data will come → further to print in PDF. The PDF format itself is not editable.
2. Or look towards server generation according to the template.
I summarize: in the source you need not a PDF, but a template.