npm i next-youtube-livechat

import { NextRequest, NextResponse } from 'next/server';

const YOUTUBE_URL = 'https://www.youtube.com';

const buildYouTubeEndpoint = (req: NextRequest) => {
  const path = req.nextUrl.pathname.replace('/api/yt-api', '');
  const suffix = `${path}${req.nextUrl.search}`;
  const url = `${YOUTUBE_URL}${suffix}`;
  return url;
};

const GET = async (req: NextRequest) => {
  const res = await fetch(buildYouTubeEndpoint(req), { cache: 'no-store' })
    .then((d) => d.text())
    .then((d) => {
      return d;
    })
    .catch((error) => {
      throw new Error(`Server Action Failed: ${error.message}`);
    });
  return NextResponse.json(res, { status: 200 });
};

const POST = async (req: NextRequest) => {
  const postData = await req.json();
  const data = await fetch(buildYouTubeEndpoint(req), {
    method: 'POST',
    cache: 'no-store',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(postData),
  })
    .then((d) => d.json())
    .catch((error) => {
      throw new Error(`Server Action Failed: ${error.message}`);
    });
  return NextResponse.json(data, { status: 200 });
};

export { GET, POST };

import { useLiveChat } from 'next-youtube-livechat';

/** Example Demo page component **/
export const Demo = () => {
  /** loading state, optional. Can use to control show spinner before fetching start & hide spinner after fetching start **/
  const [isLoading, setIsLoading] = useState<boolean>();

  /** ready state, required. Use to control start/termination of chat message polling **/
  const [isReady, setIsReady] = useState<boolean>();

  /** url state, required. Use to provide YouTube livestream target to fetch chat message **/
  const [url, setUrl] = useState<string | undefined>();

  const onBeforeStart = useCallback(async () => {
    setIsLoading(true);
  }, [setIsLoading]);

  const onStart = useCallback(async () => {
    setIsLoading(false);
    setIsReady(true);
  }, [setIsLoading, setIsReady]);

  const onChatItemsReceive = useCallback(async (newChatItems: ChatItem[], existingChatItems: ChatItem[]) => {
    console.log('new chat items', newChatItems);
    console.log('received chat items', existingChatItems);
  }, []);

  const onError = useCallback(async () => {
    setIsLoading(false);
    setIsReady(false);
    setUrl();
  }, [setIsLoading, setIsReady, setUrl]);

  const { displayedMessage, rawChatItems, liveDetails } = useLiveChat({
    url,
    isReady,
    onBeforeStart,
    onStart,
    onChatItemsReceive,
    onError,
  });

return  (<div>
          {liveDetails && (
            <div className='items-center flex flex-col justify-center'>
              <Image
                src={liveDetails.thumbnail}
                width={240}
                height={160}
                alt='thumbnail'
              />
              <div>{liveDetails.title}</div>
              <div>Channel Owner Name: {liveDetails.channelName}</div>
              <div>Channel Profile URL: {liveDetails.channelUrl}</div>
            </div>
          )}
          {displayedMessage?.map((it, index) => (
            <span key={`${it.message}${index}`}>{it.message}</span>
          ))}
        </div>)
}