Automatically skip sponsor segments in YouTube videos using SponsorBlock API
// ==UserScript==
// @name YouTube - SmartSponsorBlock
// @description Automatically skip sponsor segments in YouTube videos using SponsorBlock API
// @namespace http://tampermonkey.net/
// @icon https://cdn-icons-png.flaticon.com/64/2504/2504965.png
// @supportURL https://github.com/5tratz/Tampermonkey-Scripts/issues
// @version 0.0.8
// @author 5tratz
// @match https://www.youtube.com/*
// @match https://m.youtube.com/*
// @grant GM_xmlhttpRequest
// @connect api.sponsor.ajay.app
// @license MIT
// ==/UserScript==
(() => {
'use strict';
/* ================= CONFIG ================= */
const SB_API = 'https://api.sponsor.ajay.app/api/skipSegments';
// Only skip true sponsor segments
const SKIP_CATEGORIES = ['sponsor'];
// Small buffer to avoid skipping into another segment
const SKIP_PADDING = 0.35;
/* ================= STATE ================= */
const segmentCache = new Map(); // videoId -> segments[]
let currentVideoId = null;
let currentVideoEl = null;
/* ================= UTILS ================= */
const log = (...args) => console.debug('[SmartSponsorBlock]', ...args);
function getVideoId() {
try {
const url = new URL(location.href);
// Normal videos
if (url.searchParams.get('v')) {
return url.searchParams.get('v');
}
// Shorts
const shorts = location.pathname.match(/\/shorts\/([^/?#]+)/);
if (shorts) {
return shorts[1];
}
// Fallback
const meta = document.querySelector('meta[itemprop="videoId"]');
if (meta) {
return meta.content;
}
} catch {}
return null;
}
function getVideoElement() {
return document.querySelector('video');
}
/* ================= SPONSORBLOCK ================= */
function fetchSegments(videoId, callback) {
if (segmentCache.has(videoId)) {
callback(segmentCache.get(videoId));
return;
}
const url =
`${SB_API}?videoID=${encodeURIComponent(videoId)}` +
`&categories=${encodeURIComponent(JSON.stringify(SKIP_CATEGORIES))}`;
GM_xmlhttpRequest({
method: 'GET',
url,
headers: { Accept: 'application/json' },
onload: res => {
try {
const data = JSON.parse(res.responseText);
const segments = Array.isArray(data)
? data
.map(d => ({
start: d.segment[0],
end: d.segment[1],
category: d.category
}))
.filter(s => s.end > s.start)
.sort((a, b) => a.start - b.start)
: [];
// Merge overlaps
const merged = [];
for (const s of segments) {
const last = merged[merged.length - 1];
if (!last || s.start > last.end) {
merged.push({ ...s });
} else {
last.end = Math.max(last.end, s.end);
}
}
segmentCache.set(videoId, merged);
callback(merged);
} catch (e) {
log('Failed to parse SponsorBlock response', e);
callback([]);
}
},
onerror: () => callback([]),
ontimeout: () => callback([])
});
}
/* ================= SKIP LOGIC ================= */
function attachSkipper(videoId) {
const video = getVideoElement();
if (!video || !videoId) return;
// Same element & same video → nothing to do
if (video === currentVideoEl && videoId === currentVideoId) return;
currentVideoEl = video;
currentVideoId = videoId;
fetchSegments(videoId, segments => {
if (!segments.length) return;
let nextIndex = 0;
const skipIfNeeded = () => {
const t = video.currentTime;
while (nextIndex < segments.length) {
const seg = segments[nextIndex];
if (t >= seg.start && t < seg.end) {
video.currentTime = +(seg.end + SKIP_PADDING).toFixed(2);
log(`Skipped sponsor: ${seg.start} → ${seg.end}`);
nextIndex++;
} else if (t < seg.start) {
break;
} else {
nextIndex++;
}
}
};
const onSeeking = () => {
nextIndex = segments.findIndex(s => video.currentTime < s.end);
if (nextIndex === -1) nextIndex = segments.length;
const inside = segments.find(
s => video.currentTime >= s.start && video.currentTime < s.end
);
if (inside) {
video.currentTime = +(inside.end + SKIP_PADDING).toFixed(2);
log('Seeked into sponsor, skipped');
nextIndex = segments.indexOf(inside) + 1;
}
};
video.addEventListener('timeupdate', skipIfNeeded);
video.addEventListener('seeking', onSeeking);
// Cleanup if YouTube replaces the video element
const watcher = setInterval(() => {
if (!document.contains(video) || getVideoElement() !== video) {
video.removeEventListener('timeupdate', skipIfNeeded);
video.removeEventListener('seeking', onSeeking);
clearInterval(watcher);
currentVideoEl = null;
currentVideoId = null;
}
}, 1500);
});
}
/* ================= PAGE OBSERVER ================= */
function handleNavigation() {
setTimeout(() => {
const videoId = getVideoId();
if (videoId) attachSkipper(videoId);
}, 500); // allow player to initialize
}
function observePage() {
document.addEventListener('yt-navigate-finish', handleNavigation);
document.addEventListener('yt-page-data-updated', handleNavigation);
// Fallback (YouTube sometimes misses events)
setInterval(handleNavigation, 3000);
}
observePage();
})();