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Is nock ESM-only? Can you require() it?

HTTP server mocking and expectations library for Node.js

Last verified Sep 9, 2026 against nock@14.0.17. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

nock ships CommonJS only. require("nock") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.20.0 <20 || >=20.12.1. import "nock" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

What to do

  1. require("nock") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.20.0 <20 || >=20.12.1.
  2. From ES modules use the default import: import nock from "nock"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
14.0.17 (Jul 30, 2026)
Module format
CommonJS
Last CommonJS version
14.0.17
TypeScript types
Bundled
Node engines
>=18.20.0 <20 || >=20.12.1
Weekly downloads
4.8M
License
MIT

Does nock@14.0.17 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("nock") from a CommonJS file and import "nock" from an ES module.

Runtimerequire("nock")import "nock"
Node.js 18✓ works✓ works
Node.js 20✓ works✓ works
Node.js 22✓ works✓ works
Node.js 24✓ works✓ works
Node.js 26✓ works✓ works
Bun 1.4.0✓ works✓ works

How to import nock

ES modules (import)

import nock from "nock";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const nock = require("nock");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (395 versions; the newest 60 shown).

VersionsFormatFirst published
13.0.3 – 15.0.0CommonJSJul 27, 2020

Frequently asked

Is nock ESM-only?

nock@14.0.17 is a CommonJS package. nock ships CommonJS only. require("nock") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.20.0 <20 || >=20.12.1. import "nock" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

Can I import nock with ES module syntax?

Yes. import nock from "nock" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

Does nock work in Bun?

Yes. import "nock" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does nock ship TypeScript types?

Yes. nock bundles its own type declarations; no @types package is needed.

Links

Other commonjs packages

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