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

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Last verified Sep 9, 2026 against negotiator@1.1.0. Markdown · JSON

CommonJS CommonJS — require() works on every Node.js version we test

negotiator ships CommonJS only. require("negotiator") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18. import "negotiator" 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("negotiator") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18.
  2. From ES modules use the default import: import negotiator from "negotiator"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/negotiator
Latest
1.1.0 (Aug 20, 2026)
Module format
CommonJS
Last CommonJS version
1.1.0
TypeScript types
@types/negotiator
Node engines
>=18
Weekly downloads
183.3M
License
MIT

Does negotiator@1.1.0 actually load? Runtime test results

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

Runtimerequire("negotiator")import "negotiator"
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 negotiator

ES modules (import)

import negotiator from "negotiator";

Named imports from a CommonJS package only work when Node.js can statically detect them. If a named import fails, use the default import and destructure.

CommonJS (require)

const negotiator = require("negotiator");

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 (29 versions; the newest 29 shown).

VersionsFormatFirst published
0.1.0 – 1.1.0CommonJSJan 26, 2012

Frequently asked

Is negotiator ESM-only?

negotiator@1.1.0 is a CommonJS package. negotiator ships CommonJS only. require("negotiator") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >=18. import "negotiator" 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 negotiator with ES module syntax?

Yes. import negotiator from "negotiator" 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 negotiator work in Bun?

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

Does negotiator ship TypeScript types?

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

Links

Other commonjs packages

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