dns

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.

You can use node:dns ↗︎ for name resolution via DNS over HTTPS using Cloudflare DNS ↗︎ at 1.1.1.1.

index.jsjs

import dns from "node:dns";

let response = await dns.promises.resolve4("cloudflare.com", "NS");

index.tsts

import dns from 'node:dns';

let response = await dns.promises.resolve4('cloudflare.com', 'NS');

All node:dns functions are available, except lookup, lookupService, and resolve which throw "Not implemented" errors when called.

Note

DNS requests will execute a subrequest, counts for your Worker's subrequest limit.

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

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dns - 图1Docs

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description: Use the Node.js EventEmitter API in Cloudflare Workers to emit and listen for named events. title: EventEmitter image: https://developers.cloudflare.com/workers/runtime-apis/nodejs/eventemitter/og.png?v=ae21a2df38f5800d

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