Clean YouTube Watch Later Videos

youtube_clean_watch_later_videos.js

// This script will remove all videos from watch later list 
//
// Usage
//
// #1 go to https://www.youtube.com/playlist?list=WL
// #2 run following script
//    adjust REMOVE_BUTTON_TEXT_MAP if your language is missing

(async function() {
  const REMOVE_BUTTON_TEXT_MAP = {
    'en': 'Remove from Watch later',
    'en-GB': 'Remove from Watch later',
    'de-DE': 'Aus "Später ansehen" entfernen',
    'pt-BR': 'Remover de Assistir mais tarde'
  }
  
  const sleep = (timeout) => new Promise(res => setTimeout(res, timeout))
  const untilDefined = async (factory, timeout = 100) => {
    while (true) {
      let value = factory()
      if (value != null) return value
      await sleep(timeout)
    }
  }

  console.info("start...")
  while(true) {
    let videos = document.querySelectorAll('#primary ytd-playlist-video-renderer')
    if(videos.length == 0) break
    
    for (let videoElement of videos) {
      let videoTitle = videoElement.querySelector('a#video-title')
      console.info("remove: " + videoTitle.innerText)
      console.info("        " + videoTitle.href)

      let actionMenu = videoElement.querySelector('#menu')
      let actionMenuButton = actionMenu.querySelector('#button')

      console.debug("click actionMenuButton", actionMenuButton)
      actionMenuButton.click()
      let languageCode = document.documentElement.lang
      let removeButtonText = REMOVE_BUTTON_TEXT_MAP[languageCode] || REMOVE_BUTTON_TEXT_MAP[languageCode.split('-')[0]]
      let removeButton = await untilDefined(() => document.evaluate(
        `//ytd-popup-container/tp-yt-iron-dropdown//tp-yt-paper-item[contains(., "${removeButtonText}")]`,
        document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue);

      console.debug("click removeButton", removeButton)
      removeButton.click()
      await sleep(200)
    }
  } 
  console.info("done!")
})();