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

Tiny millisecond conversion utility

Last verified Sep 9, 2026 against ms@2.1.3. JSON

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

ms ships CommonJS only. require("ms") works everywhere. import "ms" 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.

Latest
2.1.3 (Dec 8, 2020)
Module format
CommonJS
Last CommonJS version
2.1.3
TypeScript types
@types/ms
Node engines
not declared
Weekly downloads
481.6M
License
MIT

Does ms@2.1.3 actually load? Runtime test results

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

Runtimerequire("ms")import "ms"
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✓ works✓ works

How to import ms

ES modules (import)

import ms from "ms";

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 ms = require("ms");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (19 versions; the newest 19 shown).

VersionsFormatFirst published
0.1.0 – 2.1.3CommonJSDec 21, 2011

Frequently asked

Is ms ESM-only?

ms@2.1.3 is a CommonJS package. ms ships CommonJS only. require("ms") works everywhere. import "ms" 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 ms with ES module syntax?

Yes. import ms from "ms" 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 ms work in Bun?

Yes. import "ms" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does ms ship TypeScript types?

Not bundled. Install the community types with "npm install -D @types/ms".

Links

Other commonjs packages

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