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

> nodemailer@10.0.1 ships CommonJS and ESM builds. Dual package — require() works on every Node.js version we test; import works too.

Easy as cake e-mail sending from your Node.js applications

Last verified Sep 9, 2026 against nodemailer@10.0.1.

nodemailer publishes both a CommonJS entry and a native ESM entry (ESM added in 10.0.0). require("nodemailer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=20.0.0. import "nodemailer" works alongside it.

## What to do

1. Nothing to change. require("nodemailer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=20.0.0. import * as nodemailer from "nodemailer" works alongside it; use named imports for what the ESM entry exports.
2. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 10.0.1 (Sep 7, 2026)
- Module format: Dual (CommonJS + ESM)
- Last CommonJS version: 10.0.1
- Native ESM since: 10.0.0
- TypeScript types: bundled
- Node engines: >=20.0.0
- Weekly downloads: 22.1M
- License: MIT-0

## Runtime test results for nodemailer@10.0.1

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

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

ES modules:

```js
import * as nodemailer from "nodemailer";
```

Namespace import shown because the ESM entry may have no default export; use named imports for what it exports.

CommonJS:

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

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (280 versions; the newest 60 shown).

| Versions | Format | First published |
|---|---|---|
| 10.0.0 – 10.0.1 | Dual (CommonJS + ESM) | Sep 4, 2026 |
| 6.7.5 – 9.1.1 | CommonJS | May 4, 2022 |

## Frequently asked

**Is nodemailer ESM-only?**

nodemailer@10.0.1 ships CommonJS and ESM builds. nodemailer publishes both a CommonJS entry and a native ESM entry (ESM added in 10.0.0). require("nodemailer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=20.0.0. import "nodemailer" works alongside it.

**Can I require nodemailer?**

Yes. nodemailer ships a CommonJS entry alongside the native ESM entry. require("nodemailer") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=20.0.0.

**Does nodemailer work in Bun?**

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

**Does nodemailer ship TypeScript types?**

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

## Links

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

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