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bun.sh/docs/guides/streams/to-buffer.mdx
2025-11-21 14:06:19 -08:00

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---
title: Convert a ReadableStream to a Buffer
sidebarTitle: Stream to Buffer
mode: center
---
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 [`Buffer`](https://nodejs.org/api/buffer.html) that points to it.
```ts
const stream = new ReadableStream();
const arrBuf = await Bun.readableStreamToArrayBuffer(stream);
const nodeBuf = Buffer.from(arrBuf);
```
---
See [Docs > API > Utils](/runtime/utils#bun-readablestreamto) for documentation on Bun's other `ReadableStream` conversion functions.