Simple request that shows how to get results from Facebook Ads Library

fbadslibrary.js

var session_id = self.crypto.randomUUID();
var lsd = require("LSD").token;
var dtsg = require("DTSGInitialData").token;
var uid = require("CurrentUserInitialData").USER_ID;

var params = {
    "q":"loose weight",
    "countries[0]":"US",
    "count":30,
    "session_id":session_id,
    "active_status":"all",
    "ad_type":"all",
    "media_type":"all",
    "search_type":"keyword_unordered"
};

var qs = new URLSearchParams(params).toString();
var url = `https://www.facebook.com/ads/library/async/search_ads/?${qs}`;
var f = await fetch(url, {
    "credentials": "include",
    "headers": {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:107.0) Gecko/20100101 YellowWeb",
        "Accept": "*/*",
        "Accept-Language": "ru,en-US;q=0.7,en;q=0.3",
        "Content-Type": "application/x-www-form-urlencoded",
        "X-FB-LSD": lsd,
        "Sec-Fetch-Dest": "empty",
        "Sec-Fetch-Mode": "cors",
        "Sec-Fetch-Site": "same-origin",
    },
    "body": `__user=${uid}&__a=1&fb_dtsg=${dtsg}&lsd=${lsd}`, 
    "method": "POST",
    "mode": "cors"
});
var resp = await f.text();
console.log(resp);