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

Returns true if the value is an object and not an array or null.

Last verified Sep 9, 2026 against isobject@4.1.1. Markdown · JSON

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

isobject ships CommonJS only. require("isobject") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "isobject" 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.

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

What to do

  1. require("isobject") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0.
  2. From ES modules use the default import: import isobject from "isobject"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
4.1.1 (Aug 21, 2026)
Module format
CommonJS
Last CommonJS version
4.1.1
TypeScript types
Bundled
Node engines
>=0.10.0
Weekly downloads
52.4M
License
MIT

Does isobject@4.1.1 actually load? Runtime test results

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

Runtimerequire("isobject")import "isobject"
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 isobject

ES modules (import)

import isobject from "isobject";

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 isobject = require("isobject");

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 (12 versions; the newest 12 shown).

VersionsFormatFirst published
0.1.0 – 4.1.1CommonJSJun 30, 2014

Frequently asked

Is isobject ESM-only?

isobject@4.1.1 is a CommonJS package. isobject ships CommonJS only. require("isobject") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=0.10.0. import "isobject" 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 isobject with ES module syntax?

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

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

Does isobject ship TypeScript types?

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

Links

Other commonjs packages

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