Embed JS

[btecu]

Is there a way to embed Javascript into a PDF using pdf-lib?

[Hopding]

Hello @btecu!

You certainly can. However, pdf-lib doesn't have any special APIs for this, so you'll have to use the lower-level APIs. Here's a basic example demonstrating how to create a JavaScript action dictionary with pdf-lib:

import { PDFDocument, PDFHexString } from 'pdf-lib';

const pdfDoc = await PDFDocument.create()

const jsActionDict = pdfDoc.context.obj({
  Type: 'Action',
  S: 'JavaScript',
  JS: PDFHexString.fromText(`
    // Insert the JavaScript you want to embed here...
  `),
})

// Now use the `jsActionDict`...

See section 12.6.4.16 JavaScript Actions of the PDF spec for more details about JavaScript action dictionaries and how to use them.