# Bun Convert a ReadableStream to a Uint8Array

> Convert a ReadableStream to a Uint8Array

- Skill: `jarle/bun-convert-a-readablestream-to-a-uint8array` (Agent Skill)
- Install (CLI): `npx skillmds@latest add jarle/bun-convert-a-readablestream-to-a-uint8array`
- Raw SKILL.md: https://api.skillmd.com/api/skills/jarle/bun-convert-a-readablestream-to-a-uint8array/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-readablestream-to-a-uint8array

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# Convert a ReadableStream to a Uint8Array

Bun provides a number of convenience functions for reading the contents of a [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream) into different formats. This snippet reads the contents of a `ReadableStream` to an [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer), then creates a [`Uint8Array`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array) that points to the buffer.

```ts  theme={"theme":{"light":"github-light","dark":"dracula"}}
const stream = new ReadableStream();
const buf = await Bun.readableStreamToArrayBuffer(stream);
const uint8 = new Uint8Array(buf);
```

Additionally, there is a convenience method to convert to `Uint8Array` directly.

```ts  theme={"theme":{"light":"github-light","dark":"dracula"}}
const stream = new ReadableStream();
const uint8 = await Bun.readableStreamToBytes(stream);
```

***

See [Docs > API > Utils](/runtime/utils#bun-readablestreamto) for documentation on Bun's other `ReadableStream` conversion functions.