canirequire

canirequire › ESM-only › is-obj

Is is-obj ESM-only? Can you require() it?

Check if a value is an object

Last verified Sep 9, 2026 against is-obj@3.0.0. JSON

ESM-only ESM-only since 3.0.0 — last CommonJS version is 2.0.0

is-obj dropped its CommonJS build in 3.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 2.0.0, published Apr 19, 2019.

On Node.js 20.19+, 22.12+ and every newer release, require("is-obj") works anyway: Node can load synchronous ES modules through require(). Verified on Node 20, 22, 24, 26. Node.js 18 and older still fail with ERR_REQUIRE_ESM.

Latest
3.0.0 (Apr 16, 2021)
Module format
ESM-only
Last CommonJS version
2.0.0
ESM-only since
3.0.0 (Apr 16, 2021)
TypeScript types
@types/is-obj
Node engines
>=12
Weekly downloads
54.1M
License
MIT

Does is-obj@3.0.0 actually load? Runtime test results

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

Runtimerequire("is-obj")import "is-obj"
Node.js 18✗ failsERR_REQUIRE_ESM✓ 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 is-obj

ES modules (import)

import isObj from "is-obj";

CommonJS (require)

// Node.js 20.19+ / 22.12+ / newer (package has no top-level await):
const isObj = require("is-obj");

// Any Node.js version:
const isObj = await import("is-obj");

// Or pin the last CommonJS release:
// npm install is-obj@2.0.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (4 versions; the newest 4 shown).

VersionsFormatFirst published
3.0.0ESM-onlyApr 16, 2021
1.0.0 – 2.0.0CommonJSJul 11, 2015

Frequently asked

Is is-obj ESM-only?

is-obj@3.0.0 is ESM-only. is-obj dropped its CommonJS build in 3.0.0 (April 2021). The last version you can require() on every Node.js version, including 18 and older, is 2.0.0, published Apr 19, 2019.

Which version of is-obj still supports CommonJS / require()?

2.0.0 is the last version of is-obj with a CommonJS build. Install it with "npm install is-obj@2.0.0". Every version from 3.0.0 on is ESM-only.

How do I use is-obj from a CommonJS file?

Use a dynamic import: const mod = await import("is-obj"). On Node.js 20.19+, 22.12+ and newer, a plain require("is-obj") also works for ESM packages that do not use top-level await. Alternatively pin is-obj@2.0.0.

Does is-obj work in Bun?

Yes. import "is-obj" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does is-obj ship TypeScript types?

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

Links

Other esm-only packages

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