How would I pass PDF data between models in Node?

[OctaneInteractive]

Hi!

I'm attempting to move from writeStream = fileOperations.createWriteStream( ... ) to streaming the data between models in Node.

try {
  // Create the PDF.
  pdfDoc.pipe(writeStream)
  pdfDoc.end()
  writeStream.on('finish', function () {
    return resolve(true)
  })
} catch(exception) {
  return reject(exception)
}

While this works, this example doesn't when using pdfBytes.buffer, where I'm told:

The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received undefined

try {
  // Create the PDF.
  const pdfBytes = await pdfDoc.save()
  let buffer = Buffer.from(pdfBytes, 'binary')
  return resolve(buffer)
} catch(exception) {
  return reject(exception)
}

Here I'm told:

The first argument must be of type string or an instance of Buffer, ArrayBuffer, or Array or an Array-like Object. Received an instance of PDFDocument

The PDF files I'm creating are trivial — less than 10 kilobytes — and it's pointless saving them to disk when it should be possible to pass them between methods.

Any idea how I get at the data in the pdfBytes constant?

[little-thing]

I also need answers for instant HTTP response

[Hopding]

pdfBytes is already a buffer-like object that has the serialized PDF (see https://pdf-lib.js.org/docs/api/classes/pdfdocument#save). There's no need to save it to disk. The Uint8Array is a standard type to represent binary data in JavaScript. Buffer is node-specific, but you can certainly convert a Uint8Array to a Buffer. I'm not sure how offhand, google and stackoverflow could probably help you there.