checkIfYouTubeChannelIsLive

checkIfYouTubeChannelIsLive.ts

/**
CORS blocks this request from the browser, so you will need to run this code on the server.
*/
async function checkIfYouTubeChannelIsLive ( channelId: string ) {
    const liveCheckURL = `https://www.youtube.com/embed/live_stream?channel=${ channelId }`
    const responseText = await fetch( liveCheckURL ).then( res => res.text() )
    const isLive = responseText.indexOf( 'This video is unavailable' ) < 0
    return isLive
}

This worked wonderfully, thank you @JacobWeisenburger !

you're welcome. Just curious, how did you find this?

Stackoverflow I believe, its been a blur to be honest haha, I've been doing scrapping and stuff to do this until I finally found your answer