FileReader: readAsArrayBuffer() method

Note: This feature is available in Web Workers.

The readAsArrayBuffer() method of the FileReader interface is used to start reading the contents of a specified Blob or File. When the read operation is finished, the readyState property becomes DONE, and the loadend event is triggered. At that time, the result property contains an ArrayBuffer representing the file's data.

Note: The Blob.arrayBuffer() method is a newer promise-based API to read a file as an array buffer.

Syntax

readAsArrayBuffer(blob)

Parameters

blob: The Blob or File from which to read.

Return value

None (undefined).

Specifications

Specification
File API # readAsArrayBuffer

Browser compatibility

desktop mobile server
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
Deno
readAsArrayBuffer