hodlCount.js

Comment.find({})
  .sort({ commentDate: 1 })
  .then(comments => {
    let commentsObject = {};
    comments.forEach(comment => {
      let commentDate = moment(comment.commentDate).startOf("day");

      if (!commentsObject[commentDate]) {
        commentsObject[commentDate] = 1;
      } else {
        commentsObject[commentDate] += 1;
      }
    });
    fs.writeFile(
      "hodlComments.json",
      JSON.stringify(commentsObject),
      "utf8",
      () => {
        console.log("done");
      }
    );
  });