Explain Deep cloning an object in JavaScript with an example.

Following is the code for deep cloning an object in JavaScript −


 Live Demo

<!DOCTYPE html>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   .result {
      font-size: 18px;
      font-weight: 500;
      color: rebeccapurple;
<h1>Deep cloning an object in javascript</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click the above button to deep clone the obj object</h3>
   let BtnEle = document.querySelector(".Btn");
   let resEle = document.querySelector(".result");
   let obj = {
      firstName: "Rohan",
      lastName: "Sharma",
      age: 22,
      rollNo: "A12",
   let obj1 = JSON.parse(JSON.stringify(obj));
   BtnEle.addEventListener("click", () => {
      obj.firstName = "Mohit";
      resEle.innerHTML = "obj.firstName =" + obj.firstName + "<br>";
      resEle.innerHTML += "obj1.firstName = " + obj1.firstName + "<br><br>";


The above code will produce the following output −

On clicking the ‘CLICK HERE’ button −

Updated on: 18-Jul-2020


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