ArrayBuffer.prototype.byteLength

The byteLength accessor property of ArrayBuffer instances returns the length (in bytes) of this array buffer.

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Description

The byteLength property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when the array is constructed and cannot be changed. This property returns 0 if this ArrayBuffer has been detached.

Examples

Using byteLength

js
const buffer = new ArrayBuffer(8);
buffer.byteLength; // 8

Specifications

Specification
ECMAScript Language Specification
# sec-get-arraybuffer.prototype.bytelength

Browser compatibility

desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
Deno
Node.js
byteLength

See also