Creating a BLOB from a Base64 string in JavaScript

As a software developer, you might encounter a circumstance where you need to translate a Base64 string into a JavaScript BLOB. This can come in handy in a variety of circumstances, such as when you need to store a file or an image in a database. In this article, we'll go through how to use JavaScript to generate a BLOB from a Base64 string.

What is a Base64 string?

Binary data can be represented in ASCII using a Base64 string. It is made up of a string of characters that stand in for a string of bytes. The string's characters each correspond to six bits of data. The string has a total character count that is a multiple of 4. Web applications frequently send images, files, and other binary data using Base64 encoding.

What is a BLOB?

Images, videos, and files can all be stored as binary data in BLOBs, or binary large objects. Large volumes of binary data are frequently stored in databases using BLOBs.

Converting a Base64 string to a BLOB in JavaScript

To convert a Base64 string to a BLOB in JavaScript, we can use the atob() and Blob() functions.

The atob() function decodes a Base64 string into a binary data string. It takes a Base64 string as input and returns a string of binary data.

The Blob() function creates a new BLOB object. It takes an array of binary data as input and returns a new BLOB object.

Here’s an example of how to convert a Base64 string to a BLOB in JavaScript:

const base64String = 'data:image/png;base64,iVBORw0KGg...'; // Base64 string
const binaryString = atob(base64String.split(',')[1]); // Binary data string
const blob = new Blob([binaryString], { type: 'image/png' }); // Create a BLOB object

In this example, we first extract the Base64 string from the data URI. We then use the atob() function to convert the Base64 string to a binary data string. Finally, we create a new BLOB object using the Blob() function and pass in the binary data string and the MIME type of the data.

Conclusion

In this article, we covered how to generate a BLOB in JavaScript from a Base64 string. We discovered that a BLOB is a sort of data that can hold binary data such as photos, videos, and files, and that a Base64 string is a means to represent binary data in ASCII format. We also discovered how to change a Base64 string into a BLOB in JavaScript using the atob() and Blob() APIs.

By following the steps outlined in this post, you can easily convert a Base64 string to a BLOB in JavaScript and use it in your web applications. This can be particularly useful when working with databases that store binary data.