JavaScript ArrayBuffer.byteLength property

The byteLength property return the length of an ArrayBuffer in byte. Following is the code for ArrayBuffer.byteLength property −


 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;
.sample {
   font-size: 20px;
   font-weight: 500;
<h1>JavaScript ArrayBuffer.byteLength property</h1>
<div class="sample"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to see the array buffer size</h3>
let fillEle = document.querySelector(".sample");
var buffer = new ArrayBuffer(8);
var view1 = new DataView(buffer);
view1.setInt16(0, 0x2721);
fillEle.innerHTML = view1.getInt16(0).toString(16);
   fillEle.innerHTML = 'The array buffer size is '+view1.byteLength+' bytes';


On clicking the “CLICK HERE” button −