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

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Compress and decompress data with gzip

Use Bun.gzipSync() to compress a Uint8Array with gzip.

const data = Buffer.from("Hello, world!");
const compressed = Bun.gzipSync(data);
// => Uint8Array

const decompressed = Bun.gunzipSync(compressed);
// => Uint8Array

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See Docs > API > Utils for more useful utilities.