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Is mdn-data ESM-only? Can you require() it?

Open Web data by the Mozilla Developer Network

Last verified Sep 9, 2026 against mdn-data@2.35.0. JSON

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

mdn-data ships CommonJS only. require("mdn-data") works everywhere. import "mdn-data" 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
2.35.0 (Sep 2, 2026)
Module format
CommonJS
Last CommonJS version
2.35.0
TypeScript types
None
Node engines
not declared
Weekly downloads
105.3M
License
CC0-1.0

Does mdn-data@2.35.0 actually load? Runtime test results

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

Runtimerequire("mdn-data")import "mdn-data"
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 mdn-data

ES modules (import)

import mdnData from "mdn-data";

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 mdnData = require("mdn-data");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (91 versions; the newest 60 shown).

VersionsFormatFirst published
2.0.24 – 2.35.0CommonJSDec 15, 2021

Frequently asked

Is mdn-data ESM-only?

mdn-data@2.35.0 is a CommonJS package. mdn-data ships CommonJS only. require("mdn-data") works everywhere. import "mdn-data" 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 mdn-data with ES module syntax?

Yes. import mdnData from "mdn-data" 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 mdn-data work in Bun?

Yes. import "mdn-data" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does mdn-data ship TypeScript types?

No. mdn-data ships no type declarations and there is no @types package for it.

Links

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