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

Check if a value is a plain object

Last verified Sep 9, 2026 against is-plain-obj@4.1.0. Markdown · JSON

ESM-only ESM-only since 4.0.0 — last CommonJS version is 3.0.0

is-plain-obj dropped its CommonJS build in 4.0.0 (April 2021). The last version with a plain require()-able CommonJS entry is 3.0.0, published Oct 12, 2020; it declares support for Node.js >=10.

On Node.js 20.19+, 22.12+ and newer, require("is-plain-obj") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. On Node.js 18, which has no require(esm), require("is-plain-obj") fails with ERR_REQUIRE_ESM.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("is-plain-obj") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26.
  2. From a CommonJS file, use a dynamic import inside an async function: const isPlainObj = await import("is-plain-obj"). That works on every Node.js version the package supports (>=12).
  3. If you need a synchronous require() or run Node.js 18: npm install is-plain-obj@3.0.0, the last CommonJS release (published Oct 12, 2020); it declares Node.js >=10.
  4. TypeScript: types are bundled; install nothing extra.
Latest
4.1.0 (Jun 15, 2022)
Module format
ESM-only
Last CommonJS version
3.0.0
ESM-only since
4.0.0 (Apr 16, 2021)
TypeScript types
Bundled
Node engines
>=12
Weekly downloads
112.9M
License
MIT

Does is-plain-obj@4.1.0 actually load? Runtime test results

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

Runtimerequire("is-plain-obj")import "is-plain-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 1.4.0✓ works✓ works

How to import is-plain-obj

ES modules (import)

import * as isPlainObj from "is-plain-obj";

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS (require)

// Node.js 20.19+, 22.12+ and newer (verified):
const isPlainObj = require("is-plain-obj");

// Any Node.js version the package supports (>=12), from an async function:
async function main() {
  const isPlainObj = await import("is-plain-obj");
}

// Or pin the last CommonJS release (declares Node.js >=10):
// npm install is-plain-obj@3.0.0

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 (7 versions; the newest 7 shown).

VersionsFormatFirst published
4.0.0 – 4.1.0ESM-onlyApr 16, 2021
1.0.0 – 3.0.0CommonJSJul 11, 2015

Frequently asked

Is is-plain-obj ESM-only?

is-plain-obj@4.1.0 is ESM-only. is-plain-obj dropped its CommonJS build in 4.0.0 (April 2021). The last version with a plain require()-able CommonJS entry is 3.0.0, published Oct 12, 2020; it declares support for Node.js >=10.

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

3.0.0 is the last version of is-plain-obj with a CommonJS build; it declares Node.js >=10. Install it with "npm install is-plain-obj@3.0.0". Every version from 4.0.0 on is ESM-only.

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

From a CommonJS file, use a dynamic import inside an async function: const isPlainObj = await import("is-plain-obj"). That works on every Node.js version the package supports (>=12). On Node.js 20.19+, 22.12+ and newer, require("is-plain-obj") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin is-plain-obj@3.0.0 (declares Node.js >=10).

Does is-plain-obj work in Bun?

Yes. import "is-plain-obj" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does is-plain-obj ship TypeScript types?

Yes. is-plain-obj bundles its own type declarations; no @types package is needed.

Links

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