bun.sh/docs/guides/binary/blob-to-arraybuffer.md

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Convert a Blob to an ArrayBuffer

The Blob class provides a number of methods for consuming its contents in different formats, including .arrayBuffer().

const blob = new Blob(["hello world"]);
const buf = await blob.arrayBuffer();

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See Docs > API > Binary Data for complete documentation on manipulating binary data with Bun.