bun-types/docs/guides/binary/arraybuffer-to-array.md

Type definitions and documentation for Bun, an incredibly fast JavaScript runtime

---
name: Convert an ArrayBuffer to an array of numbers
---

To retrieve the contents of an `ArrayBuffer` as an array of numbers, create a [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) over of the buffer. and use the [`Array.from()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from) method to convert it to an array.

```ts
const buf = new ArrayBuffer(64);
const arr = new Uint8Array(buf);
arr.length; // 64
arr[0]; // 0 (instantiated with all zeros)
```

---

The `Uint8Array` class supports array indexing and iteration. However if you wish to convert the instance to a regular `Array`, use `Array.from()`. (This will likely be slower than using the `Uint8Array` directly.)

```ts
const buf = new ArrayBuffer(64);
const uintArr = new Uint8Array(buf);
const regularArr = Array.from(uintArr);
// number[]
```

---

See [Docs > API > Binary Data](https://bun.sh/docs/api/binary-data#conversion) for complete documentation on manipulating binary data with Bun.