How to check if an object is an instance of a Class in JavaScript?

JavascriptWeb DevelopmentObject Oriented Programming

Following is the code to check if an object is an instance of a class in JavaScript −


 Live Demo

<!DOCTYPE html>
<html lang="en">
<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: 20px;
      font-weight: 500;
      color: blueviolet;
<h1>Check if an object is an instance of a Class</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to check if student1 object is an instance of Student</h3>
   let resEle = document.querySelector(".result");
   function Student(name, age, standard) { = name;
      this.age = age;
      this.standard = standard;
   let student1 = new Student("Rohan", 18, 12);
   document.querySelector(".Btn").addEventListener("click", () => {
      if (student1 instanceof Student) {
         resEle.innerHTML = "student1 is instance of Student";
      } else {
         resEle.innerHTML = "student1 is not an instance of Student";


On clicking the ‘CLICK HERE’ button −

Updated on 20-Jul-2020 07:49:06