# Is ethereumjs-util ESM-only? Can you require() it?

> ethereumjs-util@7.1.5 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

A collection of utility functions for Ethereum

Last verified Sep 9, 2026 against ethereumjs-util@7.1.5.

ethereumjs-util ships CommonJS only. require("ethereumjs-util") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.0.0. import "ethereumjs-util" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

## What to do

1. require("ethereumjs-util") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.0.0.
2. From ES modules use the default import: import ethereumjsUtil from "ethereumjs-util"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 7.1.5 (Jun 3, 2022)
- Module format: CommonJS
- Last CommonJS version: 7.1.5
- TypeScript types: bundled
- Node engines: >=10.0.0
- Weekly downloads: 2.2M
- License: MPL-2.0

## Runtime test results for ethereumjs-util@7.1.5

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

| Runtime | require("ethereumjs-util") | import "ethereumjs-util" |
|---|---|---|
| Node.js 18 | works | 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 ethereumjs-util

ES modules:

```js
import ethereumjsUtil from "ethereumjs-util";
```

CommonJS:

```js
const ethereumjsUtil = require("ethereumjs-util");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (84 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 1.3.8 – 7.1.5 | CommonJS | Sep 10, 2015 |

## Frequently asked

**Is ethereumjs-util ESM-only?**

ethereumjs-util@7.1.5 is a CommonJS package. ethereumjs-util ships CommonJS only. require("ethereumjs-util") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=10.0.0. import "ethereumjs-util" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

**Can I import ethereumjs-util with ES module syntax?**

Yes. import ethereumjsUtil from "ethereumjs-util" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

**Does ethereumjs-util work in Bun?**

Yes. import "ethereumjs-util" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does ethereumjs-util ship TypeScript types?**

Yes. ethereumjs-util bundles its own type declarations; no @types package is needed.

## Links

- [ethereumjs-util on npm](https://www.npmjs.com/package/ethereumjs-util)
- [Source repository](https://github.com/ethereumjs/ethereumjs-monorepo)
- [HTML version](https://canirequire.com/package/ethereumjs-util/)
- [JSON version](https://canirequire.com/package/ethereumjs-util.json)

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