This is a simple script used to read all comments from an Instagram account photo. Tested on this link: https://www.instagram.com/p/BLlhP-yDplV/

get-all-comments-and-parse.js

var container = $('._mo9iw._123ym');
var button = $('._l086v._ifrvy');

var scrollAndClick = () => {
  container.scrollTop = 0;
  button.click();
};

var startScrollAndClick = (finishCallback) => {
  scrollAndClick();
  setTimeout(() => {
    if (button.offsetParent !== null) {
      startScrollAndClick();
    }
    else {
      console.info('Fetching all comments finished.');
      if (typeof finishCallback === 'function') {
        finishCallback();
      }
    }
  }, 1000);
};

var classifyComment = () => {
  window.__valueMap = {};
  var commentList = document.querySelectorAll('._nk46a');
  for (var i = 1; i < commentList.length; i++) {
    var comment = commentList[i].children[1].innerHTML.replace(/<!-- [/]?react-text(:\s{1}[0-9]+)? -->/g, '');
    var content;
    try {
      content = parseInt(comment, 10) + '';
      if (window.__valueMap[content]) {
        window.__valueMap[content]++;
      }
      else {
        window.__valueMap[content] = 1;
      }
    }
    catch (err) {
      content = '';
    }
  }

  console.info(window.__valueMap);
};

startScrollAndClick(() => {
  classifyComment();
});