var getid=async function(sec_user_id,max_cursor){
  var res=await fetch("https://www.douyin.com/aweme/v1/web/aweme/post/?device_platform=webapp&aid=6383&channel=channel_pc_web&sec_user_id="+sec_user_id+"&max_cursor="+max_cursor, {
    "headers": {
    "accept": "application/json, text/plain, */*",
    "accept-language": "vi",
    "sec-ch-ua": "\"Not?A_Brand\";v=\"8\", \"Chromium\";v=\"108\", \"Microsoft Edge\";v=\"108\"",
    "sec-ch-ua-mobile": "?0",
    "sec-ch-ua-platform": "\"Windows\"",
    "sec-fetch-dest": "empty",
    "sec-fetch-mode": "cors",
    "sec-fetch-site": "same-origin"
    },
    "referrer": "https://www.douyin.com/user/MS4wLjABAAAAu8qwDm1-muGuMhZZ-tVzyPVWlUxIbQRNJN_9k83OhWU",
    "referrerPolicy": "strict-origin-when-cross-origin",
    "body": null,
    "method": "GET",
    "mode": "cors",
    "credentials": "include"
  });
  try{
      res=await res.json();
  }catch(e){
    res=await getid(sec_user_id,max_cursor);
    console.log(e);
  }
  return res;
}

var download=async function(url, aweme_id, desc){
  var file_name = aweme_id + "-" + desc + ".mp4";
  var data=await fetch(url, {
  "headers": {
    "accept": "*/*",
    "accept-language": "vi,en-US;q=0.9,en;q=0.8",
    "range": "bytes=0-",
    "sec-ch-ua": "\"Not?A_Brand\";v=\"8\", \"Chromium\";v=\"108\", \"Microsoft Edge\";v=\"108\"",
    "sec-ch-ua-mobile": "?0",
    "sec-ch-ua-platform": "\"Windows\"",
    "sec-fetch-dest": "video",
    "sec-fetch-mode": "cors",
    "sec-fetch-site": "cross-site"
  },
  "referrer": "https://www.douyin.com/",
  "referrerPolicy": "strict-origin-when-cross-origin",
  "body": null,
  "method": "GET",
  "mode": "cors",
  "credentials": "omit"
});
  data=await data.blob();
  var a = document.createElement("a");
  a.href = window.URL.createObjectURL(data);
  a.download = file_name;
  a.click();
}

var waitforme=function(millisec) {
    return new Promise(resolve => {
        setTimeout(() => { resolve('') }, millisec);
    })
}

var run=async function(){
  var result=[];
  var hasMore=1;
  var sec_user_id=location.pathname.replace("/user/","");
  var max_cursor=0;
  var download_from=prompt("Enter id video(Enter 0 if want to download all video):","");
  if(download_from==null || download_from=="") {
    alert("Please, Enter id of video!");
    return;
  }
  while(hasMore==1){
    var moredata=await getid(sec_user_id,max_cursor);
    hasMore=moredata['has_more'];
    max_cursor=moredata['max_cursor'];
    for(var i in moredata['aweme_list']){
      if(moredata['aweme_list'][i]['aweme_id'] == download_from){
        hasMore=0;
        break;
      }
      if(moredata['aweme_list'][i]['video']['play_addr']['url_list'][0].startsWith("https"))
        result.push([moredata['aweme_list'][i]['video']['play_addr']['url_list'][0],moredata['aweme_list'][i]['aweme_id'],moredata['aweme_list'][i]['desc']]);
      else
        result.push([moredata['aweme_list'][i]['video']['play_addr']['url_list'][0].replace("http","https"),moredata['aweme_list'][i]['aweme_id'],moredata['aweme_list'][i]['desc']]);
      console.clear();
      console.log("Number of videos: "+result.length);
    }
  }
  for(var i=result.length-1;i>=0;i--){
    await waitforme(5000);
    try{download(result[i][0],result[i][1],result[i][2]);}catch{}
  }
}
run();




















lenh 2  


var getid = async function(sec_user_id, max_cursor) {
  var res = await fetch("https://www.douyin.com/aweme/v1/web/aweme/post/?device_platform=webapp&aid=6383&channel=channel_pc_web&sec_user_id=" + sec_user_id + "&max_cursor=" + max_cursor, {
    "headers": {
      "accept": "application/json, text/plain, */*",
      "accept-language": "vi",
      "sec-ch-ua": "\"Not?A_Brand\";v=\"8\", \"Chromium\";v=\"108\", \"Microsoft Edge\";v=\"108\"",
      "sec-ch-ua-mobile": "?0",
      "sec-ch-ua-platform": "\"Windows\"",
      "sec-fetch-dest": "empty",
      "sec-fetch-mode": "cors",
      "sec-fetch-site": "same-origin"
    },
    "referrer": "https://www.douyin.com/user/MS4wLjABAAAAu8qwDm1-muGuMhZZ-tVzyPVWlUxIbQRNJN_9k83OhWU",
    "referrerPolicy": "strict-origin-when-cross-origin",
    "body": null,
    "method": "GET",
    "mode": "cors",
    "credentials": "include"
  });
  try {
    res = await res.json();
  } catch (e) {
    res = await getid(sec_user_id, max_cursor);
    console.log(e);
  }
  return res;
}

var download = async function(url, aweme_id, desc, channel) {
  var file_name = channel + "/" + aweme_id + "-" + desc + ".mp4";
  var data = await fetch(url, {
    "headers": {
      "accept": "*/*",
      "accept-language": "vi,en-US;q=0.9,en;q=0.8",
      "range": "bytes=0-",
      "sec-ch-ua": "\"Not?A_Brand\";v=\"8\", \"Chromium\";v=\"108\", \"Microsoft Edge\";v=\"108\"",
      "sec-ch-ua-mobile": "?0",
      "sec-ch-ua-platform": "\"Windows\"",
      "sec-fetch-dest": "video",
      "sec-fetch-mode": "cors",
      "sec-fetch-site": "cross-site"
    },
    "referrer": "https://www.douyin.com/",
    "referrerPolicy": "strict-origin-when-cross-origin",
    "body": null,
    "method": "GET",
    "mode": "cors",
    "credentials": "omit"
  });
  data = await data.blob();
  var a = document.createElement("a");
  a.href = window.URL.createObjectURL(data);
  a.download = file_name;
  a.click();
}

var waitforme = function(millisec) {
  return new Promise(resolve => {
    setTimeout(() => { resolve('') }, millisec);
  })
}

var run = async function() {
  var result = [];
  var hasMore = 1;
  var sec_user_id = location.pathname.replace("/user/", "");
  var max_cursor = 0;
  var download_from = prompt("Enter the video ID (Enter 0 if you want to download all videos):", "");
  if (download_from == null || download_from == "") {
    alert("Please enter the video ID!");
    return;
  }
  var channel = prompt("Enter the channel link:", "");
  if (channel == null || channel == "") {
    alert("Please enter the channel link!");
    return;
  }
  while (hasMore == 1) {
    var moredata = await getid(sec_user_id, max_cursor);
    hasMore = moredata['has_more'];
    max_cursor = moredata['max_cursor'];
    for (var i in moredata['aweme_list']) {
      if (moredata['aweme_list'][i]['aweme_id'] == download_from) {
        hasMore = 0;
        break;
      }
      if (moredata['aweme_list'][i]['video']['play_addr']['url_list'][0].startsWith("https"))
        result.push([moredata['aweme_list'][i]['video']['play_addr']['url_list'][0], moredata['aweme_list'][i]['aweme_id'], moredata['aweme_list'][i]['desc'], channel]);
      else
        result.push([moredata['aweme_list'][i]['video']['play_addr']['url_list'][0].replace("http", "https"), moredata['aweme_list'][i]['aweme_id'], moredata['aweme_list'][i]['desc'], channel]);
      console.clear();
      console.log("Number of videos: " + result.length);
    }
  }
  for (var i = result.length - 1; i >= 0; i--) {
    await waitforme(5000);
    try { download(result[i][0], result[i][1], result[i][2], result[i][3]); } catch {}
  }
}
run();