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

a JSON logging library for node.js services

Last verified Sep 9, 2026 against bunyan@1.8.15. JSON

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

bunyan ships CommonJS only. require("bunyan") works everywhere. import "bunyan" 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
1.8.15 (Jan 8, 2021)
Module format
CommonJS
Last CommonJS version
1.8.15
TypeScript types
@types/bunyan
Node engines
not declared
Weekly downloads
2.7M
License
MIT

Does bunyan@1.8.15 actually load? Runtime test results

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

Runtimerequire("bunyan")import "bunyan"
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 bunyan

ES modules (import)

import bunyan from "bunyan";

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 bunyan = require("bunyan");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (112 versions; the newest 60 shown).

VersionsFormatFirst published
0.18.3 – 2.0.5CommonJSMar 2, 2013

Frequently asked

Is bunyan ESM-only?

bunyan@1.8.15 is a CommonJS package. bunyan ships CommonJS only. require("bunyan") works everywhere. import "bunyan" 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 bunyan with ES module syntax?

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

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

Does bunyan ship TypeScript types?

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

Links

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