Instagram Get ID from URL or Short

instagram_get_id.js

  const shortcodeToInstaID = Shortcode => {
    var char
    var id = 0
    var alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_'
    for (var i = 0; i < Shortcode.length; i++) {
      char = Shortcode[i]
      var mul = id * 64
      id = mul + alphabet.indexOf(char)
    }
    return id
  }

instagram_get_shortcode_id.js

function getInstagramUrlFromMediaId(media_id) {
    var alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_';
    var shortenedId = '';
    media_id = media_id.substring(0, media_id.indexOf('_'));

    while (media_id > 0) {
        var remainder = bigInt(media_id).mod(64);
        media_id = bigInt(media_id).minus(remainder).divide(64).toString();
        shortenedId = alphabet.charAt(remainder) + shortenedId;
    }

    return 'https://www.instagram.com/p/' + shortenedId + '/';
}