zlib

Last updated Apr 23, 2026 Note

For compatibility dates of 2026-08-04 or later, Workers enables both nodejs_compat and nodejs_compat_v2 by default. These flags are not used for these compatibility dates. Existing projects do not need to remove them when updating their compatibility date. For earlier dates, add nodejs_compat to your Wrangler configuration file to opt in. For instructions to turn off Node.js compatibility, refer to the Node.js compatibility flag.

The node:zlib module provides compression functionality implemented using Gzip, Deflate/Inflate, and Brotli. To access it:

import zlib from "node:zlib";

The full node:zlib API is documented in the Node.js documentation for node:zlib ↗︎.

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