Clone all documents of collection to another

cloneCollection.js

/**
 * Get all documents of collection
 * @param db {Object} - MongoDB connection
 * @param collectionName {String} - Collection name
 * @returns {Promise<Array>}
 */
async function getDocs(db, collectionName) {
  const collection = db.collection(collectionName);
  const cursor = await collection.find();
  return cursor.toArray();
}

/**
 * Clone all documents collection to another
 * @param db {Object} - MongoDB connection
 * @param originalCollection {String} - The original collection
   * @param destinationCollection {String} - The destination collection
 * @returns {Promise<*>}
 */
async function cloneCollection(db, originalCollection, destinationCollection) {
  const docs = await getDocs(db, originalCollection);
  return db.collection(destinationCollection).insertMany(docs); // Check here for errors: https://docs.mongodb.com/manual/reference/method/db.collection.insertMany/
}