how to check if an element has a particular class in javascript code example

Example 1: javascript check if element has class

if(document.getElementById("myElmentID").classList.contains("hidden")){
// I have the 'hidden' class
}

Example 2: check if a class exists javascript

const element = document.querySelector("#box");

element.classList.contains("active");

Example 3: check if element with class has another class javascript

const div = document.querySelector('div');
div.classList.contains('secondary'); // trueCode language: JavaScript (javascript)