arnoudhgz

Open your playlist in your browser, scroll all the way to the bottom (Youtube music does not show all at once), open your developer tools, run this in the console:

(async () => {
  const buttons = document.querySelectorAll('button.ytSpecButtonShapeNextHost[aria-pressed="false"][aria-label="Like"]');
  console.log(`Found ${buttons.length} Like buttons to click`);
  for (const btn of buttons) {
    btn.click();
 await new Promise(r => setTimeout(r, 500));