Parsing custom objects in JSON.parse in javascript

parse.js

// This script is executed in mongo shell to replace all occurence of a STRING, with an objectId string
// and then using parse, converting objectId string to actual objectId

db.Dummy.find({}).forEach(function(doc) {
  console.log(doc._id);
  let newDoc = JSON.stringify(doc).replace('STRING', '5ab23ff3423159ad5d0251c0');
  print('newDoc', newDoc);

  let jsonDoc = JSON.parse(newDoc, (key, value) => {
    if (value === '5ab23ff3423159ad5d0251c0') {
      return ObjectId(value);
    } else {
      return value;
    }
  });
  print(jsonDoc);

  delete jsonDoc._id;

  db.Dummy.findOneAndUpdate(
    { _id: doc._id },
    {
      $set: jsonDoc
    }
  );
});