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

> etag@1.8.1 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Create simple HTTP ETags

Last verified Sep 9, 2026 against etag@1.8.1.

etag ships CommonJS only. require("etag") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.6. import "etag" 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("etag") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.6.
2. From ES modules use the default import: import etag from "etag"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: npm install -D @types/etag

## Facts

- Latest: 1.8.1 (Sep 13, 2017)
- Module format: CommonJS
- Last CommonJS version: 1.8.1
- TypeScript types: @types/etag
- Node engines: >= 0.6
- Weekly downloads: 100.0M
- License: MIT

## Runtime test results for etag@1.8.1

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

| Runtime | require("etag") | import "etag" |
|---|---|---|
| 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 etag

ES modules:

```js
import etag from "etag";
```

CommonJS:

```js
const etag = require("etag");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (14 versions; the newest 14 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.0 – 1.8.1 | CommonJS | May 18, 2014 |

## Frequently asked

**Is etag ESM-only?**

etag@1.8.1 is a CommonJS package. etag ships CommonJS only. require("etag") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 0.6. import "etag" 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 etag with ES module syntax?**

Yes. import etag from "etag" 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 etag work in Bun?**

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

**Does etag ship TypeScript types?**

Not bundled. Install the community types with "npm install -D @types/etag".

## Links

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

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