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

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

Last verified Sep 9, 2026 against nodemailer@10.0.1. Markdown · JSON

Dual (CommonJS + ESM) Dual package — require() works on every Node.js version we test; import works too

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.
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

Does nodemailer@10.0.1 actually load? Runtime test results

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

Runtimerequire("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 (import)

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 (require)

const nodemailer = require("nodemailer");

Module format by version

Derived from the type, main and exports fields of every stable release on npm, corrected where a runtime test of that version contradicted them (280 versions; the newest 60 shown).

VersionsFormatFirst published
10.0.0 – 10.0.1Dual (CommonJS + ESM)Sep 4, 2026
6.7.5 – 9.1.1CommonJSMay 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

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