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

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Convert a Buffer to a blob

A Blob can be constructed from an array of "chunks", where each chunk is a string, binary data structure (including Buffer), or another Blob.

const buf = Buffer.from("hello");
const blob = new Blob([buf]);

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