Download all visible telegram stickers images

stickers-downloader.js

// How to download telegram sticker images
/*
1. Go to Telegram Web;
2. Open console (F12);
3. Paste the code below in the console and press Enter;
4. Open your stickers menu and make sure you see the sticker pack you want to download (so Telegram will load it).
5. At the console paste and run "downloadStickers()" any time you want to download a pack.
6. [Convert .webm to another format](http://www.freewaregenius.com/convert-webp-image-format-jpg-png-format/);
7. Happy hacking.

If you close the tab or refresh it, you should do step 3 again.
*/

// Main function
function downloadStickers() {
  // Find all sticker sets
  const sets = querySelectorAll('.composer_stickerset_wrap')
    // We need it's title to prompt users
    .map(set => {
      const $title = querySelector('.composer_stickerset_title', set);
      
      return {
        key: $title.attributes['data-stickerset'].value,
        title: $title.innerText,
        node: set,
      };
    })
    // Those without key aren't packs. "Frequently used" for example.
    .filter(({key}) => key !== '');
  
  // Ask which pack the user want to download
  const selectedSet = prompt(
      // Join them into a list of keys-titles
      sets
        .map(({title}, i) => `[${i}]: ${title}`)
        .join('\n')
  );
  
  // Find all images
  querySelectorAll('img', sets[+selectedSet].node)
      // Only care about it's URL
      .map(i => i.attributes.src.value)
      // Filter those with `sticker` in the URL
      // .filter(i => /sticker/.test(i)))
      // Download all
      .forEach(download);
}

// DOM query helpers
// These two do 90% of what you need JQuery for
const querySelector = (query, el = window.document) =>
  el.querySelector(query);

const querySelectorAll = (query, el = window.document) =>
  Array.from(el.querySelectorAll(query));

// Trigger a download
function download(image) {
  // Create a dummy element
  var a = document.createElement('a');
  a.href = image;
  // `download` attribute means that clicks trigger download
  a.download = "";
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
}