Create an Instagram downloader API with Nodejs

const axios = require('axios');
const { parse } = require("node-html-parser");

const instagramPostLink = "https://www.instagram.com/p/CD5um-vHA33/";

async function getPostLink(url) {

  url = url + 'embed' + '/captioned';


  let res = axios.get(url).then(async (response) => {
    const root = parse(response.data);

    let link = "";
    if (response.data.search("video_url") != -1)
      link = getVideoLinkFromHtml(response.data);
    else
      link = root.querySelector('img.EmbeddedMediaImage').getAttribute("src");





    while (link.search("&") != -1) {
      link = link.replace("&", "&");
    }
    let caption =await getCaptionFromHtml(response.data);

    return {link,caption};

  });

  return res;

}

async function getCaption(url) {


  url = url + 'embed' + '/captioned';

  let res = axios.get(url).then((response) => {

    let caption= getCaptionFromHtml(response.data);

    return caption;

  });

  return res;

}

async function getCaptionFromHtml(html) {


  const root = parse(html);

  let caption=root.querySelector('.Caption')?.text;
  if(caption == undefined)
      caption="No caption";

  caption=caption.replace("view all comments","");
  return caption;

}

function getVideoLinkFromHtml(html) {
  let crop = "{\"" + html.substring(html.search("video_url"), html.search("video_url") + 1000);

  crop = crop.substring(0, crop.search(",")) + "}";

  return JSON.parse(crop).video_url;
}

(async ()=>{
    await getPostLink(instagramPostLink);
})();