files/en-us/web/javascript/reference/global_objects/arraybuffer/resizable/index.md

---
title: ArrayBuffer.prototype.resizable
short-title: resizable
slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/resizable
page-type: javascript-instance-accessor-property
browser-compat: javascript.builtins.ArrayBuffer.resizable
sidebar: jsref
---

The **`resizable`** accessor property of {{jsxref("ArrayBuffer")}} instances returns whether this array buffer can be resized or not.

{{InteractiveExample("JavaScript Demo: ArrayBuffer.prototype.resizable")}}

```js interactive-example
const buffer1 = new ArrayBuffer(8, { maxByteLength: 16 });
const buffer2 = new ArrayBuffer(8);

console.log(buffer1.resizable);
// Expected output: true

console.log(buffer2.resizable);
// Expected output: false
```

## Description

The `resizable` 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. If the `maxByteLength` option was set in the constructor, `resizable` will return `true`; if not, it will return `false`.

## Examples

### Using resizable

In this example, we create a 8-byte buffer that is resizable to a max length of 16 bytes, then check its `resizable` property, resizing it if `resizable` returns `true`:

```js
const buffer = new ArrayBuffer(8, { maxByteLength: 16 });

if (buffer.resizable) {
  console.log("Buffer is resizable!");
  buffer.resize(12);
}
```

## Specifications

{{Specifications}}

## Browser compatibility

{{Compat}}

## See also

- {{jsxref("ArrayBuffer")}}
- {{jsxref("ArrayBuffer.prototype.maxByteLength")}}
- {{jsxref("ArrayBuffer.prototype.resize()")}}