Converting a base64 string to a blob in JavaScript

Web browsers provide a variety of data primitives that web developers use to manage, manipulate, and store data – from plain text, to files, images, videos and more. However, using them correctly and effectively can be confusing. One such example is converting a base64 string to a blob using JavaScript. A blob represents binary data in the form of files, such as images or video. Suppose you have an image in string format that needs to be uploaded to a server

Web browsers provide a variety of data primitives that web developers use to manage, manipulate, and store data – from plain text, to files, images, videos and more. However, using them correctly and effectively can be confusing. One such example is converting a base64 string to a blob using JavaScript. A blob represents binary data in the form of files, such as images or video. Suppose you have an image in string format that needs to be uploaded to a server. However, the available API accepts the image in blob format only. What do you do?

According to various solutions around the Internet, conversion appears to be complex. Manipulating byte arrays? No thanks. Fortunately, there’s an easier, modern approach available thanks to the Fetch API. It’s a powerful feature built into all web browsers that is commonly used to fetch resources across the network, like making HTTP requests to your backend APIs.

Fetch returns a Response object. As it turns out, it can convert data into more than just JSON, it can also return array buffers, form data, and blobs. In this case, we’ll use blobs.

Easy as one, two

First, pass a base64 string to fetch:

const base64Data = "aGV5IHRoZXJl";
const base64 = await fetch(base64Data);

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