Play Base64 Encoded .WAV Sound File with JavaScript - Step-by-Step Guide

Introduction

Playing a sound file in a web application is a common requirement these days. In this tutorial, we will learn how to play a Base64 encoded .WAV sound file using JavaScript. We will provide a step-by-step guide to help you understand the process.

Prerequisites

Before we start, you should have a basic understanding of JavaScript and HTML. You should also have a sound file in Base64 encoded .WAV format ready to use.

Step-by-Step Guide

Step 1: Create an audio element

The first step is to create an audio element in HTML. To do this, add the following code inside the body of your HTML file:

<audio id="audio"></audio>

Step 2: Convert Base64 string to ArrayBuffer

Next, we need to convert the Base64 string of the sound file to an ArrayBuffer in JavaScript. To do this, use the following code:

const base64 = "BASE64_STRING"; //replace BASE64_STRING with your own Base64 string
const binaryString = window.atob(base64);
const bytes = new Uint8Array(binaryString.length);
for (let i = 0; i < binaryString.length; i++) {
    bytes[i] = binaryString.charCodeAt(i);
}
const buffer = bytes.buffer;

Step 3: Create a Blob object

After converting the Base64 string to an ArrayBuffer, we need to create a Blob object from it. To do this, use the following code:

const blob = new Blob([buffer], { type: "audio/wav" });

Step 4: Set the audio source

Now that we have the Blob object, we can set it as the source of our audio element. To do this, use the following code:

const audio = document.getElementById("audio");
audio.src = URL.createObjectURL(blob);

Step 5: Play the sound file

Finally, we can play the sound file by calling the play() method on our audio element. To do this, use the following code:

audio.play();

Conclusion

In this tutorial, we have learned how to play a Base64 encoded .WAV sound file using JavaScript. We have provided a step-by-step guide to help you understand the process. By following these steps, you can easily play any sound file in your web application.