markUdemyWatched.js

// Mark every video as watched or unwatched on udemy.com
// 
// 1. Go to a Udemy course
// 2. Open the Developer Console. (COMMAND+ALT+I on Mac)
// 3. Paste this into the Developer Console and run it


(() => {
    const markWatched = false;
    let toggleCount = 0;

    const sleep = ({seconds}) =>
        new Promise((proceed) => {
            console.log(`Waiting for ${seconds} seconds...`);
            setTimeout(proceed, seconds * 1000);
        });

    const toggleAll = async () => {
        const $sectionHeadings = '[data-purpose$="section-heading"]';
        const sectionHeadings = Array.from(document.querySelectorAll($sectionHeadings)).filter(section => section.getAttribute('aria-expanded') === 'false');

        await Promise.all(
            sectionHeadings.map(async heading => {
                heading && heading.click()
                await sleep({
                    seconds: 3
                });
            }
        ));

        const toggleButtons = Array.from(document.querySelectorAll('[data-purpose$="progress-toggle-button"]')).filter(btn => btn.checked !== markWatched);
        console.log(`Marking ${toggleButtons.length} courses as watched...`);

        await Promise.all(
            toggleButtons.map(async toggleButton => {
                toggleButton && toggleButton.click() && toggleCount++;
            }
        ));
    };

    toggleAll();
})();