# Is @ethersproject/networks ESM-only? Can you require() it?

> @ethersproject/networks@5.8.0 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Network definitions for ethers.

Last verified Sep 9, 2026 against @ethersproject/networks@5.8.0.

@ethersproject/networks ships CommonJS only. require("@ethersproject/networks") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@ethersproject/networks" 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.

It also declares a "module" field, so bundlers such as webpack, Vite and esbuild pick up an ESM build for tree-shaking.

## What to do

1. require("@ethersproject/networks") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
2. From ES modules use the default import: import networks from "@ethersproject/networks"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 5.8.0 (Feb 26, 2025)
- Module format: CommonJS
- Last CommonJS version: 5.8.0
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 1.6M
- License: MIT

## Runtime test results for @ethersproject/networks@5.8.0

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

| Runtime | require("@ethersproject/networks") | import "@ethersproject/networks" |
|---|---|---|
| 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 @ethersproject/networks

ES modules:

```js
import networks from "@ethersproject/networks";
```

CommonJS:

```js
const networks = require("@ethersproject/networks");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (28 versions; the newest 28 shown).

| Versions | Format | First published |
|---|---|---|
| 5.0.0 – 5.8.0 | CommonJS | Jun 13, 2020 |

## Frequently asked

**Is @ethersproject/networks ESM-only?**

@ethersproject/networks@5.8.0 is a CommonJS package. @ethersproject/networks ships CommonJS only. require("@ethersproject/networks") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@ethersproject/networks" 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 @ethersproject/networks with ES module syntax?**

Yes. import networks from "@ethersproject/networks" 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 @ethersproject/networks work in Bun?**

Yes. import "@ethersproject/networks" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does @ethersproject/networks ship TypeScript types?**

Yes. @ethersproject/networks bundles its own type declarations; no @types package is needed.

## Links

- [@ethersproject/networks on npm](https://www.npmjs.com/package/@ethersproject/networks)
- [Source repository](https://github.com/ethers-io/ethers.js)
- [HTML version](https://canirequire.com/package/@ethersproject/networks/)
- [JSON version](https://canirequire.com/package/@ethersproject/networks.json)

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