Converts an html page with image links to an html page with base64 links in node.js

base64Html.js

const fs = require('fs');
const request = require('request');
const { JSDOM } = require('jsdom');
const $ = require('jquery');
const pretty = require('pretty');

function convertImagesToBase64(inputFile, outputFile) {
  fs.readFile(inputFile, 'utf8', (err, htmlContent) => {
    if (err) throw err;

    const dom = new JSDOM(htmlContent);
    const $ = require('jquery')(dom.window);

    const imgElements = $('img');
    let pendingRequests = imgElements.length;

    imgElements.each((index, img) => {
      const src = img.getAttribute('src');

      if (src.startsWith('http')) {
        request.get({ url: src, encoding: null }, (err, response, body) => {
          if (err) throw err;
          const imgB64 = Buffer.from(body).toString('base64');
          img.setAttribute('src', 'data:image/png;base64,' + imgB64);
          pendingRequests--;
          if (pendingRequests === 0) writeOutput();
        });
      } else {
        fs.readFile(src, (err, imgData) => {
          if (err) throw err;
          const imgB64 = Buffer.from(imgData).toString('base64');
          img.setAttribute('src', 'data:image/png;base64,' + imgB64);
          pendingRequests--;
          if (pendingRequests === 0) writeOutput();
        });
      }
    });

    function writeOutput() {
      const prettyHtml = pretty(dom.serialize());
      fs.writeFile(outputFile, prettyHtml, 'utf8', (err) => {
        if (err) throw err;
        console.log('Converted images to base64 and saved the output in', outputFile);
      });
    }
  });
}

// Get command-line arguments
const args = process.argv.slice(2);

if (args.length !== 2) {
  console.log('Usage: node convert_images_to_base64.js input_file output_file');
  process.exit(1);
}

const inputFile = args[0];
const outputFile = args[1];

// Example usage:
convertImagesToBase64(inputFile, outputFile);