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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. 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 you can require() on every Node.js version, including 18 and older, is 6.3.0, published Jan 1, 2022.

On Node.js 20.19+, 22.12+ and every newer release, require("camelcase") 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.

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

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✓ works✓ works

How to import camelcase

ES modules (import)

import camelcase from "camelcase";

CommonJS (require)

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

// Any Node.js version:
const camelcase = await import("camelcase");

// Or pin the last CommonJS release:
// npm install camelcase@6.3.0

Module format by version

Derived from the type, main and exports fields of every stable release on npm (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 you can require() on every Node.js version, including 18 and older, is 6.3.0, published Jan 1, 2022.

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

6.3.0 is the last version of camelcase with a CommonJS build. 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?

Use a dynamic import: const mod = await import("camelcase"). On Node.js 20.19+, 22.12+ and newer, a plain require("camelcase") also works for ESM packages that do not use top-level await. Alternatively pin camelcase@6.3.0.

Does camelcase work in Bun?

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

Does camelcase ship TypeScript types?

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

Links

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