The arrayBuffer() method in the Blob interface returns a Promise that resolves with the contents of the blob as binary data contained in an ArrayBuffer.


var bufferPromise = blob.arrayBuffer();

blob.arrayBuffer().then(buffer => /* process the ArrayBuffer */);

var buffer = await blob.arrayBuffer();




A promise that resolves with an ArrayBuffer that contains the blob's data in binary form.


While this method doesn't throw exceptions, it may reject the promise. This can happen, for example, if the reader used to fetch the blob's data throws an exception. Any exceptions thrown while getting the data will be converted into rejections.

Usage notes

While similar to the FileReader.readAsArrayBuffer() method, arrayBuffer() returns a promise rather than being an event-based API, as is the case with the FileReader interface's method.


Specification Status Comment
File API
The definition of 'Blob.arrayBuffer()' in that specification.
Working Draft

Browser compatibility

BCD tables only load in the browser

See also