Failed to parse PDF document (line:2 col:630 offset=354): No PDF header found

[devluked]

What were you trying to do?

Trying to download the PDF

How did you attempt to do it?

    const promise = new Promise(async (resolve, reject) => {
      this.setState({ disabled: true });
      const { downloadURL } = this.props;
      fileUrl = await downloadURL(doc.media_file_id);
      if (fileUrl) resolve(fileUrl);
    });

    //await file url
    promise.then(async () => {
      //fetch PDF data and load into variable
      const existingPdfBytes = await fetch(fileUrl.url).then((res) =>
        res.arrayBuffer()
      );
      const pdfDoc = await PDFDocument.load(existingPdfBytes, {
        ignoreEncryption: true,
      });

This line is causing the code to break:

  const pdfDoc = await PDFDocument.load(existingPdfBytes, {
        ignoreEncryption: true,
      });

What actually happened?

i get the warning about the header missing

What did you expect to happen?

the document to download

How can we reproduce the issue?

    const promise = new Promise(async (resolve, reject) => {
      this.setState({ disabled: true });
      const { downloadURL } = this.props;
      fileUrl = await downloadURL(doc.media_file_id);
      if (fileUrl) resolve(fileUrl);
    });

    //await file url
    promise.then(async () => {
      //fetch PDF data and load into variable
      const existingPdfBytes = await fetch(fileUrl.url).then((res) =>
        res.arrayBuffer()
      );
      const pdfDoc = await PDFDocument.load(existingPdfBytes, {
        ignoreEncryption: true,
      });
      const helveticaFont = await pdfDoc.embedFont(StandardFonts.Helvetica);

Line where the code crashes:

      const pdfDoc = await PDFDocument.load(existingPdfBytes, {
        ignoreEncryption: true,
      });

Version

1.16

What environment are you running pdf-lib in?

Browser

Checklist

• [X] My report includes a Short, Self Contained, Correct (Compilable) Example.
• [X] I have attached all PDFs, images, and other files needed to run my SSCCE.

Additional Notes

No response

[cgrady3]

I also got this error, looks like I'm doing everything right according to the pdf-lib docs and yet...errors.

[devluked]

@cgrady3 Sigh yeah don't know why this is happening, driving me nuts. Btw is your picture in Bryce Canyon?

[cgrady3]

My teammate found that we didn't run into the issue if we fed it in as base64 instead of uint8.

Antelope canyon but good eye!

[Gcarter17]

Found out this was actually a CORS issue, first time pulling down a file from my storage bucket and all. Setup CORS and works just fine now. If you're using firebase check out this link https://jefrydco.id/en/blog/fix-cors-issue-firebase-google-cloud/

[jerry-flam]

I have this issue with v1.17.1 and I worked around it by converting the file to PDF/A using ghostscript.

My code is like this:

const { PDFDocument } = require('pdf-lib');
const fs = require('fs');
const { execSync } = require('child_process');

try {
  await PDFDocument.load(fs.readFileSync(`./pdfs/file.pdf`), {
    ignoreEncryption: true,
    throwOnInvalidObject: true,
  });
} catch (error) {
  const command =
    `gs -sDEVICE=pdfwrite -dBATCH -dNOPAUSE -dSAFER ` +
    `-sColorConversionStrategy=UseDeviceIndependentColor -dEmbedAllFonts=true ` +
    `-dPrinted=true -dPDFA -sProcessColorModel=DeviceRGB -dPDFACompatibilityPolicy=1 ` +
    `-dDetectDuplicateImages -r210 -dFastWebView=true ` +
    `-sOutputFile=./pdfs/file_fixed.pdf ./pdfs/file.pdf`;

  execSync(command);
}