# Bun Convert a Uint8Array to an ArrayBuffer

> Convert a Uint8Array to an ArrayBuffer

- Skill: `jarle/bun-convert-a-uint8array-to-an-arraybuffer` (Agent Skill)
- Install (CLI): `npx skillmds@latest add jarle/bun-convert-a-uint8array-to-an-arraybuffer`
- Raw SKILL.md: https://api.skillmd.com/api/skills/jarle/bun-convert-a-uint8array-to-an-arraybuffer/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: jarle (https://skillmd.com/u/jarle)
- Updated: 2026-09-21
- Page: https://skillmd.com/skills/jarle/bun-convert-a-uint8array-to-an-arraybuffer

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# Convert a Uint8Array to an ArrayBuffer

A [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) is a *typed array* class, meaning it is a mechanism for viewing data in an underlying `ArrayBuffer`. The underlying `ArrayBuffer` is accessible via the `buffer` property.

```ts  theme={"theme":{"light":"github-light","dark":"dracula"}}
const arr = new Uint8Array(64);
arr.buffer; // => ArrayBuffer(64)
```

***

The `Uint8Array` may be a view over a *subset* of the data in the underlying `ArrayBuffer`. In this case, the `buffer` property will return the entire buffer, and the `byteOffset` and `byteLength` properties will indicate the subset.

```ts  theme={"theme":{"light":"github-light","dark":"dracula"}}
const arr = new Uint8Array(64, 16, 32);
arr.buffer; // => ArrayBuffer(64)
arr.byteOffset; // => 16
arr.byteLength; // => 32
```

***

See [Docs > API > Binary Data](/runtime/binary-data#conversion) for complete documentation on manipulating binary data with Bun.