Skip to main content

Bun home page

[Runtime

](../../../index.md)[Package Manager

](../../../pm/cli/install/index.md)[Bundler

](../../../bundler/index.md)[Test Runner

](../../../test/index.md)[Guides

](../../index.md)[Reference

](https://bun.com/reference)[Blog

](https://bun.com/blog)[Feedback

](../../../feedback/index.md)

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.

index.ts

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 for more information on working with Buffer and other binary data formats in Bun.

Was this page helpful?

Suggest editsRaise issue

[

Read a file as a string

Previous

](../string/index.md)[

Read a file to a Uint8Array

Next

](../uint8array/index.md)