Which Data Type Sometimes Is Called Blob?


Angela Bailey

Data types are an essential concept in programming. They define the kind of data a variable can hold and the operations that can be performed on it.

One such data type that is sometimes called a Blob is the Binary Large Object.

What is a Blob?

A Blob is a data type used to store large amounts of binary data, such as images, audio files, or even entire video files. It represents unstructured data in its rawest form and can store any type of binary data, including text and non-text formats.

Why use a Blob?

Blobs are particularly useful when working with large files that cannot be easily stored directly in a database or manipulated as regular text. By utilizing Blobs, you can efficiently manage and transmit binary data within your applications.

Creating a Blob

To create a Blob object in JavaScript, you can use the Blob() constructor. The constructor takes an array of ArrayBuffer, ArrayBufferView, or Blobs as its parameter, allowing you to combine multiple binary chunks into one Blob.

Here’s an example of creating a Blob from an image file:

const imageBlob = new Blob([imageFile], { type: 'image/jpeg' });

Working with Blobs

Once you have created a Blob object, there are several operations you can perform on it. Some common ones include:

  • Reading the contents: You can read the contents of a Blob using the FileReader API. This allows you to access and manipulate the binary data.
  • Uploading: Blobs are often used for uploading files to servers.

    You can send a Blob as part of a form submission or via AJAX.

  • Downloading: Blobs can also be used to generate downloadable files. By creating an anchor element and setting the Blob as its href, you can allow users to download the binary data.

Browser Support

Blobs are supported in all modern web browsers, including Chrome, Firefox, Safari, and Edge. However, it’s essential to note that older versions of Internet Explorer do not support the Blob API.


In summary, a Blob is a data type used to store large amounts of binary data. It is particularly useful for managing and manipulating images, audio files, and other non-text formats.

By understanding how to create and work with Blobs, you can enhance your web applications by efficiently handling binary data.

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