Convert an ArrayBuffer to a Blob

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You can construct a Blob from an array of "chunks", where each chunk is a string, binary data structure, or another Blob.

const buf = new ArrayBuffer(64);
const blob = new Blob([buf]);

By default the type of the resulting Blob is unset. Set it with the type option.

const buf = new ArrayBuffer(64);
const blob = new Blob([buf], { type: "application/octet-stream" });
blob.type; // => "application/octet-stream"