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bun.sh/docs/guides/binary/arraybuffer-to-blob.mdx
2025-11-21 14:06:19 -08:00

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---
title: Convert an ArrayBuffer to a Blob
sidebarTitle: "ArrayBuffer to Blob"
mode: center
---
A [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob) can be constructed from an array of "chunks", where each chunk is a string, binary data structure, or another `Blob`.
```ts
const buf = new ArrayBuffer(64);
const blob = new Blob([buf]);
```
---
By default the `type` of the resulting `Blob` will be unset. This can be set manually.
```ts
const buf = new ArrayBuffer(64);
const blob = new Blob([buf], { type: "application/octet-stream" });
blob.type; // => "application/octet-stream"
```
---
See [Docs > API > Binary Data](/runtime/binary-data#conversion) for complete documentation on manipulating binary data with Bun.