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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 .json() to read and parse the contents of a .json file as a plain object. The MIME type of the BunFile will be set accordingly.

index.ts

const path = "/path/to/package.json";
const file = Bun.file(path);

const contents = await file.json();
// { name: "my-package" }

file.type; // => "application/json;charset=utf-8";

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