bun.sh/docs/guides/util/base64.md

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Encode and decode base64 strings

Bun implements the Web-standard atob and btoa functions for encoding and decoding base64 strings.

const data = "hello world";
const encoded = btoa(data); // => "aGVsbG8gd29ybGQ="
const decoded = atob(encoded); // => "hello world"

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See Docs > Web APIs for a complete breakdown of the Web APIs implemented in Bun.