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Is log4js ESM-only? Can you require() it?

Port of Log4js to work with node.

Last verified Sep 9, 2026 against log4js@6.9.1. Markdown · JSON

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

log4js ships CommonJS only. require("log4js") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8.0. import "log4js" 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("log4js") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8.0.
  2. From ES modules use the default import: import log4js from "log4js"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
6.9.1 (Mar 8, 2023)
Module format
CommonJS
Last CommonJS version
6.9.1
TypeScript types
Bundled
Node engines
>=8.0
Weekly downloads
5.0M
License
Apache-2.0

Does log4js@6.9.1 actually load? Runtime test results

Installed and executed on Sep 9, 2026 with require("log4js") from a CommonJS file and import "log4js" from an ES module.

Runtimerequire("log4js")import "log4js"
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 log4js

ES modules (import)

import log4js from "log4js";

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 log4js = require("log4js");

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 (152 versions; the newest 60 shown).

VersionsFormatFirst published
2.5.1 – 6.9.1CommonJSJan 17, 2018

Frequently asked

Is log4js ESM-only?

log4js@6.9.1 is a CommonJS package. log4js ships CommonJS only. require("log4js") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=8.0. import "log4js" 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 log4js with ES module syntax?

Yes. import log4js from "log4js" 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 log4js work in Bun?

Yes. import "log4js" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does log4js ship TypeScript types?

Yes. log4js bundles its own type declarations; no @types package is needed.

Links

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