FileReader: readAsArrayBuffer() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

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

js
readAsArrayBuffer(blob)

Parameters

blob

The Blob or File from which to read.

Return value

None (undefined).

Specifications

Specification
File API
# readAsArrayBuffer

Browser compatibility

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See also