node.js kullanarak URL parse edip, ardından split ile id'yi çekebilirsin hocam. Örnek olarak:

var address = "[URL]https://m.tiktok.com/v/6805867805452324102.html[/URL]";
var parsedAddress = url.parse(address, true);
var html = parsedAddress.pathname;
var x = html.split('.');
var id = x[0];

Bu linklere de bakabilirsin:
​https://www.w3schools.com/nodejs/nodejs_url.asp​​​
​https://www.w3schools.com/jsref/jsref_split.asp​​​