Skip to content

Instantly share code, notes, and snippets.

@mikesmullin

mikesmullin/spotify_js.md

Created May 7, 2025 23:12
Show Gist options
  • Save mikesmullin/a186a7857b46b8521bd90a7acb797b3a to your computer and use it in GitHub Desktop.
Save mikesmullin/a186a7857b46b8521bd90a7acb797b3a to your computer and use it in GitHub Desktop.
Download ZIP
Spotify Javascript Automation
Raw
spotify_js.md

Spotify Javascript Automation

I'm doing this because Spotify has an annoying bug, where it cannot set the volume properly when I click (it instead picks a random low-numbered value like 0.23, than the one I chose 0.9.)

  1. open devtools (F12) > debugger > search
  2. search for: 
    this._harmony.setVolume
  3. click the "format source" button
  4. set breakpoint on it (cdn/build/web-player/web-player.*.js:21600)
  5. adjust volume normally, to catch breakpoint
  6. input in console: 
    window.HARMONY = this._harmony
  7. remove breakpoint and continue
  8. now you can control from console: 
    await HARMONY.setVolume(0.9)
    (some PlayerAPIClientError errors are normal, if music has not begun playing)

Harmony is the vendored web player module a.k.a. window.webpackChunkclient_web[0][1]['4310']

P.S. also interesting 1 2

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment