canirequire › CommonJS › log4js
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. JSON
CommonJS CommonJS — require() works on every Node.js version
log4js ships CommonJS only. require("log4js") works everywhere. 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.
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.
| Runtime | require("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 | ✓ 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 (152 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 2.5.1 – 6.9.1 | CommonJS | Jan 17, 2018 |
Frequently asked
Is log4js ESM-only?
log4js@6.9.1 is a CommonJS package. log4js ships CommonJS only. require("log4js") works everywhere. 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 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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