Blob()

The Blob() constructor returns a new Blob object. The content of the blob consists of the concatenation of the values given in the parameter array.

Syntax

new Blob(array);
new Blob(array, options);

Parameters

array

An Array of ArrayBuffer, ArrayBufferView, Blob, USVString objects, or a mix of any of such objects, that will be put inside the Blob. USVString objects are encoded as UTF-8.

options Optional

An optional object of type BlobPropertyBag which may specify any of the following properties:

type Optional: The MIME type of the data that will be stored into the blob. The default value is the empty string, ("").
endings Optional: How to interpret newline characters (\n) within the contents, if the data is text. The default value, transparent, copies newline characters into the blob without changing them. To convert newlines to the host system's native convention, specify the value native.

Return value

A new Blob object containing the specified data.

Example

const array = ['<a id="a"><b id="b">hey!</b></a>']; // an array consisting of a single DOMString
const blob = new Blob(array, {type : 'text/html'}); // the blob

Specifications

Specification
File API # constructorBlob

Browser compatibility

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