Convert a Blob to a Uint8Array

The Blob class provides several methods for consuming its contents in different formats. Use .bytes() to read the contents as a Uint8Array.

const blob = new Blob(["hello world"]);
const arr = await blob.bytes();

Alternatively, read the contents into an ArrayBuffer with .arrayBuffer(), then create a Uint8Array from the buffer.

const blob = new Blob(["hello world"]);
const arr = new Uint8Array(await blob.arrayBuffer());

See Binary Data.