The ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer.

It is an array of bytes, often referred to in other languages as a "byte array". You cannot directly manipulate the contents of an ArrayBuffer; instead, you create one of the typed array objects or a DataView object which represents the buffer in a specific format, and use that to read and write the contents of the buffer.

The ArrayBuffer() constructor creates a new ArrayBuffer of the given length in bytes. You can also get an array buffer from existing data, for example, from a Base64 string or from a local file.

ArrayBuffer is a transferable object.



Creates a new ArrayBuffer object.

Static properties

get ArrayBuffer[@@species]

The constructor function that is used to create derived objects.

Static methods


Returns true if arg is one of the ArrayBuffer views, such as typed array objects or a DataView. Returns false otherwise.

Instance properties


The initial value of the @@toStringTag property is the string "ArrayBuffer". This property is used in Object.prototype.toString().


The read-only size, in bytes, of the ArrayBuffer. This is established when the array is constructed and cannot be changed.

Instance methods


Returns a new ArrayBuffer whose contents are a copy of this ArrayBuffer's bytes from begin (inclusive) up to end (exclusive). If either begin or end is negative, it refers to an index from the end of the array, as opposed to from the beginning.


Creating an ArrayBuffer

In this example, we create a 8-byte buffer with a Int32Array view referring to the buffer:

const buffer = new ArrayBuffer(8);
const view = new Int32Array(buffer);


ECMAScript Language Specification
# sec-arraybuffer-objects

Browser compatibility

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See also