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canirequire › ESM-only › change-case

Is change-case ESM-only? Can you require() it?

Transform a string between `camelCase`, `PascalCase`, `Capital Case`, `snake_case`, `kebab-case`, `CONSTANT_CASE` and others

Last verified Sep 9, 2026 against change-case@5.4.4. JSON

ESM-only ESM-only since 5.0.0 — last CommonJS version is 4.1.2

change-case dropped its CommonJS build in 5.0.0 (September 2023). The last version you can require() on every Node.js version, including 18 and older, is 4.1.2, published Dec 2, 2020.

On Node.js 20.19+, 22.12+ and every newer release, require("change-case") 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
5.4.4 (Apr 3, 2024)
Module format
ESM-only
Last CommonJS version
4.1.2
ESM-only since
5.0.0 (Sep 30, 2023)
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
20.4M
License
MIT

Does change-case@5.4.4 actually load? Runtime test results

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

Runtimerequire("change-case")import "change-case"
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 change-case

ES modules (import)

import changeCase from "change-case";

CommonJS (require)

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

// Any Node.js version:
const changeCase = await import("change-case");

// Or pin the last CommonJS release:
// npm install change-case@4.1.2

Module format by version

Derived from the type, main and exports fields of every stable release on npm (45 versions; the newest 45 shown).

VersionsFormatFirst published
5.0.0 – 5.4.4ESM-onlySep 30, 2023
0.0.1 – 4.1.2CommonJSApr 15, 2013

Frequently asked

Is change-case ESM-only?

change-case@5.4.4 is ESM-only. change-case dropped its CommonJS build in 5.0.0 (September 2023). The last version you can require() on every Node.js version, including 18 and older, is 4.1.2, published Dec 2, 2020.

Which version of change-case still supports CommonJS / require()?

4.1.2 is the last version of change-case with a CommonJS build. Install it with "npm install change-case@4.1.2". Every version from 5.0.0 on is ESM-only.

How do I use change-case from a CommonJS file?

Use a dynamic import: const mod = await import("change-case"). On Node.js 20.19+, 22.12+ and newer, a plain require("change-case") also works for ESM packages that do not use top-level await. Alternatively pin change-case@4.1.2.

Does change-case work in Bun?

Yes. import "change-case" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does change-case ship TypeScript types?

Yes. change-case bundles its own type declarations; no @types package is needed.

Links

Other esm-only packages

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