Lodash's cloneDeep() Function

Lodash’s cloneDeep() Function

Lodash’s cloneDeep() Function

In this post, we will give you information about Lodash’s cloneDeep() Function. Here we will give you detail about Lodash’s cloneDeep() Function And how to use it also give you a demo for it if it is necessary.

You can use lodash’s cloneDeep() function to deep copy a value.

const _ = require('lodash');

const obj = [{ a: 1, b: 2 }];

const copy = _.cloneDeep(obj);
console.log(copy); // [{ a: 1, b: 2 }];

With Classes

If you call cloneDeep() on an instance of a class, cloneDeep() will also copy the class information.

class MyClass {};
const obj  = new MyClass();

const copy = _.cloneDeep(obj);
copy instanceof MyClass; // true

Warning: Proxies

cloneDeep() does not work well with Mongoose documents or reactive objects in Vue.
With Vue, the cloned object will not be reactive.
With Mongoose documents, you won’t be able to save the cloned document.

const _ = require('lodash');
const mongoose = require('mongoose');
async function run() {
  await mongoose.connect('mongodb://localhost:27017/test5');

  const arr2Schema = new mongoose.Schema({ _id: false, prop1: String });
  const arr1Schema = new mongoose.Schema({ _id: false, arr2: [arr2Schema] });
  const Test = mongoose.model(
    new mongoose.Schema({
      arr1: [arr1Schema],
      field: String,

  let doc = new Test({ arr1: [{ arr2: [{ prop1: 'test' }] }] });
  await doc.save();

  const doc2 = await Test.findById(doc._id);
  const newDoc = _.cloneDeep(doc2).set({ field: 'test' });

  await newDoc.save(); // Mongoose-internal TypeError


In general, we only recommend using cloneDeep() on POJOs.

Lodash is a JavaScript library that provides utility functions for common programming tasks using the functional programming paradigm. Lodash is a JavaScript library that helps programmers write more concise and maintainable JavaScript. It can be broken down into several main areas: Utilities: for simplifying common programming tasks such as determining type as well as simplifying math operations(Lodash’s cloneDeep() Function).

Why Lodash?

Lodash makes JavaScript easier by taking the hassle out of working with arrays, numbers, objects, strings, etc.Lodash’s modular methods are great for:

  • Iterating arrays, objects, & strings
  • Manipulating & testing values
  • Creating composite functions

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