What is a Blob in JavaScript?

In this post, we’ll be discussing what a Blob is in JavaScript, how it can be used, and some of the browser compatibility issues that you may come across.

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What is a Blob?

In computer programming, a blob (binary large object), pronounced BLAHB, is a collection of data stored as a single unit. Blobs are typically images, audio or other multimedia objects, though sometimes binary executable code is stored as a blob. Storing blobs in databases is commonly used to store large amounts of unstructured data ( BLOB stands for BL ock-level O bject storage).

How can you create a Blob?

There are several ways to create a Blob:
-The simplest way is to create a new Blob() constructor. This will create an empty blob.
-If you have an existing ArrayBuffer or other binary data, you can create a Blob from it using the Blob() constructor’s second argument, which specifies the blob’s content type.
-If you have an existing string of text, you can convert it to a blob using the Blob() constructor’s third argument, which specifies the string’s encoding.

What are the benefits of using a Blob?

A Blob object represents a file-like object of immutable, raw data; they can be read as text or binary data, or converted into a ReadableStream so its methods can be used for processing the data. Blobs can represent data that isn’t necessarily in a JavaScript-native format: for example, an image file.

Blobs allow you to construct file like objects on the client that you can pass to apis that expect urls instead of requiring the server to have access to the actual files. A common use case is uploading images to face detection or tagging APIs.

How can you use a Blob?

A Blob is a file-like object of immutable, raw data. Blobs represent data that isn’t necessarily in a JavaScript-native format. The File interface is based on Blob, inheriting blob functionality and expanding it to support files on the user’s system.

Blobs can represent data that isn’t necessarily in a JavaScript-native format. For example, Blobs can represent images, video, audio, andraw binary data. Also, find out how to use a Blob as a URL for hyperlinking purposes.

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