Feeding PDF generated from pdfkit as input to pdf-lib for merging - node.js

Question

I am trying to send a pdfkit generated pdf file as input to pdflib for merging. I am using async function. My project is being developed using sails Js version:"^1.2.3", "node": "^12.16", my pdf-kit version is: "^0.11.0", "pdf-lib": "^1.9.0",
This is the code:
const textbytes=fs.readFileSync(textfile);
var bytes1 = new Uint8Array(textbytes);
const textdoc = await PDFDocumentFactory.load(bytes1)
The error i am getting is:
UnhandledPromiseRejectionWarning: Error: Failed to parse PDF document (line:0 col:0 offset=0): No PDF header found
Please help me with this issue.

Answer 1

You really don't need this line.
var bytes1 = new Uint8Array(textbytes);
By just reading the file and sending textbytes in the parameters is more than enough.
I use this function to merge an array of pdfBytes to make one big PDF file:
async function mergePdfs(pdfsToMerge)
{
const mergedPdf = await pdf.PDFDocument.create();
for (const pdfCopyDoc of pdfsToMerge)
{
const pdfDoc = await pdf.PDFDocument.load(pdfCopyDoc);
const copiedPages = await mergedPdf.copyPages(pdfDoc, pdfDoc.getPageIndices());
copiedPages.forEach((page) => {
mergedPdf.addPage(page);
});
}
const mergedPdfFile = await mergedPdf.save();
return mergedPdfFile;
};
So basically after you add the function mergePdfs(pdfsToMerge)
You can just use it like this:
const textbytes = fs.readFileSync(textfile);
const textdoc = await PDFDocumentFactory.load(bytes1)
let finalPdf = await mergePdfs(textdoc);