tiktok_download_video.js

const fs = require("fs");
const useragentFromSeed = require("useragent-from-seed");
const axios = require("axios").default;

function getString(start, end, all) {
  const regex = new RegExp(`${start}(.*?)${end}`);
  const str = all;
  const result = regex.exec(str);
  return result[1];
}

async function downloadTiktokVideo(url) {
  const headers = {
    authority: "www.tiktok.com",
    "cache-control": "max-age=0",
    "upgrade-insecure-requests": "1",
    "user-agent": useragentFromSeed(),
    accept:
      "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
    "sec-fetch-site": "none",
    "sec-fetch-mode": "navigate",
    "sec-fetch-user": "?1",
    "sec-fetch-dest": "document",
    "accept-language": "id-ID,id;q=0.9,en-US;q=0.8,en;q=0.7",
  };

  const response = await axios.get(url, {headers});
  if (response.status !== 200) {
    return null;
  }

  const script = getString(
    '<script id="SIGI_STATE" type="application/json">',
    "</script>",
    response.data
  );
  if (script === null) {
    return null;
  }

  const state = JSON.parse(script);
  const videoUrl = state.ItemList.video.preloadList[0].url;
  if (videoUrl === undefined) {
    return null;
  }

  const writer = fs.createWriteStream("video.mp4");
  const videoStream = await axios.get(videoUrl, {responseType: "stream"});
  videoStream.data.pipe(writer);
  return new Promise((res, rej) => {
    let error;
    writer.on("error", (err) => {
      error = err;
      rej(err);
    });
    writer.on("close", () => {
      if (!error) res(true);
    });
  });
}

const url = "https://www.tiktok.com/@kino_top20/video/7136618947327184134";
downloadTiktokVideo(url);