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

Convert a dash/dot/underscore/space separated string to camelCase or PascalCase: `foo-bar` → `fooBar`

Last verified Sep 9, 2026 against camelcase@9.0.0. Markdown · JSON

ESM-only ESM-only since 7.0.0 — last CommonJS version is 6.3.0

camelcase dropped its CommonJS build in 7.0.0 (June 2022). The last version with a plain require()-able CommonJS entry is 6.3.0, published Jan 1, 2022; it declares support for Node.js >=10.

On Node.js 20.19+, 22.12+ and newer, require("camelcase") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Node.js 18 has no require(esm), and camelcase@9.0.0 declares Node.js >=20, so 18 is outside its supported range anyway.

camelcase@9.0.0 declares engines ">=20", so Node.js 18 is outside its supported range regardless of module format.

What to do

  1. On Node.js 20.19+, 22.12+ and newer, require("camelcase") 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 camelcase = await import("camelcase"). That works on every Node.js version the package supports (>=20).
  3. If you need a synchronous require() or run Node.js 18: npm install camelcase@6.3.0, the last CommonJS release (published Jan 1, 2022); it declares Node.js >=10.
  4. camelcase@9.0.0 declares engines ">=20", so Node.js 18 is unsupported regardless: upgrade Node.js or pin an older release.
  5. TypeScript: types are bundled; install nothing extra.
Latest
9.0.0 (Nov 10, 2025)
Module format
ESM-only
Last CommonJS version
6.3.0
ESM-only since
7.0.0 (Jun 6, 2022)
TypeScript types
Bundled
Node engines
>=20
Weekly downloads
95.7M
License
MIT

Does camelcase@9.0.0 actually load? Runtime test results

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

Runtimerequire("camelcase")import "camelcase"
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 camelcase

ES modules (import)

import * as camelcase from "camelcase";

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 camelcase = require("camelcase");

// Any Node.js version the package supports (>=20), from an async function:
async function main() {
  const camelcase = await import("camelcase");
}

// Or pin the last CommonJS release (declares Node.js >=10):
// npm install camelcase@6.3.0

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 (27 versions; the newest 27 shown).

VersionsFormatFirst published
7.0.0 – 9.0.0ESM-onlyJun 6, 2022
1.0.0 – 6.3.0CommonJSOct 12, 2014

Frequently asked

Is camelcase ESM-only?

camelcase@9.0.0 is ESM-only. camelcase dropped its CommonJS build in 7.0.0 (June 2022). The last version with a plain require()-able CommonJS entry is 6.3.0, published Jan 1, 2022; it declares support for Node.js >=10.

Which version of camelcase still supports CommonJS / require()?

6.3.0 is the last version of camelcase with a CommonJS build; it declares Node.js >=10. Install it with "npm install camelcase@6.3.0". Every version from 7.0.0 on is ESM-only.

How do I use camelcase from a CommonJS file?

From a CommonJS file, use a dynamic import inside an async function: const camelcase = await import("camelcase"). That works on every Node.js version the package supports (>=20). On Node.js 20.19+, 22.12+ and newer, require("camelcase") works with the latest version: Node.js loads synchronous ES modules through require(). Verified on Node.js 20, 22, 24 and 26. Alternatively pin camelcase@6.3.0 (declares Node.js >=10).

Does camelcase work in Bun?

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

Does camelcase ship TypeScript types?

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

Links

Other esm-only packages

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