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---
name: Read a file to an ArrayBuffer
---
The `Bun.file()` function accepts a path and returns a `BunFile` instance. The `BunFile` class extends `Blob` and allows you to lazily read the file in a variety of formats. Use `.arrayBuffer()` to read the file as an `ArrayBuffer`.
```ts
const path = "/path/to/package.json";
const file = Bun.file(path);
const buffer = await file.arrayBuffer();
```
---
The binary content in the `ArrayBuffer` can then be read as a typed array, such as `Uint8Array`.
```ts
const buffer = await file.arrayBuffer();
const bytes = new Uint8Array(buffer);
bytes[0];
bytes.length;
```
---
Refer to the [Typed arrays](/docs/api/binary-data#typedarray) docs for more information on working with typed arrays in Bun.
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