> ## Documentation Index
> Fetch the complete documentation index at: https://bun-1dd33a4e-farm-dc5e99a7-serve-route-target-normalization.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Read a file to a Buffer

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.

To read the file into a `Buffer` instance, first use `.arrayBuffer()` to consume the file as an `ArrayBuffer`, then use `Buffer.from()` to create a `Buffer` from the `ArrayBuffer`.

```ts index.ts icon="https://mintcdn.com/bun-1dd33a4e-farm-dc5e99a7-serve-route-target-normalization/irnPaIf5BInKUovc/icons/typescript.svg?fit=max&auto=format&n=irnPaIf5BInKUovc&q=85&s=749f5ca3fc8733d63266eddb19569000" theme={null}
const path = "/path/to/package.json";
const file = Bun.file(path);

const arrbuf = await file.arrayBuffer();
const buffer = Buffer.from(arrbuf);
```

***

Refer to [Binary data > Buffer](/runtime/binary-data#buffer) for more information on working with `Buffer` and other binary data formats in Bun.


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