a crappy script to get RSS feeds from your channel subscriptions at https://www.youtube.com/feed/channels

youtube_feeds.user.js

// ==UserScript==
// @name        get feeds
// @namespace   Violentmonkey Scripts
// @match       https://www.youtube.com/feed/channels
// @grant       none
// @version     1.0
// @author      -
// @description 8/9/2022, 11:24:20 PM
// ==/UserScript==

// probably a really fragile script to export youtube subscriptions as individual RSS feeds
let feeds = ytInitialData
  .contents
  .twoColumnBrowseResultsRenderer
  .tabs[0]
  .tabRenderer
  .content
  .sectionListRenderer
  .contents[0]
  .itemSectionRenderer
  .contents[0]
  .shelfRenderer
  .content
  .expandedShelfContentsRenderer
  .items
  .map(channel => {
    return [
      channel.channelRenderer.title.simpleText,
      `https://www.youtube.com/feeds/videos.xml?channel_id=${channel.channelRenderer.channelId}`
    ];
  });

let downloadBtn = document.createElement('button');
downloadBtn.innerText = 'get feeds';
downloadBtn.addEventListener('click', () => {
  download('feeds.json', JSON.stringify(feeds, null, 2));
});

window.onload = () => {
  setTimeout(() => {
    document.getElementById('contents').prepend(downloadBtn);
  }, 2500);                  
};

function download(filename, text) {
  let element = document.createElement('a');
  element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
  element.setAttribute('download', filename);
  element.style.display = 'none';
  document.body.appendChild(element);
  element.click();
  document.body.removeChild(element);
}