How to get content of page if it is image

[l2ysho]

I have lot of pdf files which are combination of text pages and image pages (some pages are just one big image). I wonder if I can somehow get content of this pages (as buffer ? ), because page.getTextContent() on this pages returns empty object { items: [], styles: [Object: null prototype] {} } (well that make sense)

This is my actual experimental code where I can retrieve text from pages one by one

const loadingTask = pdfjsLib.getDocument({ data: fileData });
const pdfDocument = await loadingTask.promise;
const numPages = pdfDocument.numPages;

for (let pageNumber = 1; pageNumber <= numPages; pageNumber++) {
        const page = await pdfDocument.getPage(pageNumber);
        const textContent = await page.getTextContent();
 }

      ```

[l2ysho]

Totally forgot about this, if anyone still looking for solution, it can be done with canvas.

minimal example

import { createCanvas } from 'canvas'; // npm install canvas
import * as pdfjsLib from 'pdfjs-dist/legacy/build/pdf.mjs';

const loadingTask = pdfjsLib.getDocument({ data: fileData });
const pdfDocument = await loadingTask.promise;

for (let pageNumber = 1; pageNumber <= pdfDocument.numPages; pageNumber++) {
  const page = await pdfDocument.getPage(pageNumber);
  const viewport = page.getViewport({ scale: 2.0 });

  const canvas = createCanvas(viewport.width, viewport.height);
  const context = canvas.getContext('2d');

  await page.render({ canvasContext: context, viewport }).promise;

  const buffer = canvas.toBuffer('image/png'); // ← your image buffer
  // do something with buffer (save, OCR, etc.)
}

Or you can check my implementation ✌️