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Is ipaddr.js ESM-only? Can you require() it?

A library for manipulating IPv4 and IPv6 addresses in JavaScript.

Last verified Sep 9, 2026 against ipaddr.js@2.5.0. JSON

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

ipaddr.js ships CommonJS only. require("ipaddr.js") works everywhere. import "ipaddr.js" 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.

Latest
2.5.0 (Aug 4, 2026)
Module format
CommonJS
Last CommonJS version
2.5.0
TypeScript types
Bundled
Node engines
>= 10
Weekly downloads
121.8M
License
MIT

Does ipaddr.js@2.5.0 actually load? Runtime test results

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

Runtimerequire("ipaddr.js")import "ipaddr.js"
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✓ works✓ works

How to import ipaddr.js

ES modules (import)

import ipaddrJs from "ipaddr.js";

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 ipaddrJs = require("ipaddr.js");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (38 versions; the newest 38 shown).

VersionsFormatFirst published
0.1.0 – 2.5.0CommonJSJul 28, 2011

Frequently asked

Is ipaddr.js ESM-only?

ipaddr.js@2.5.0 is a CommonJS package. ipaddr.js ships CommonJS only. require("ipaddr.js") works everywhere. import "ipaddr.js" 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 ipaddr.js with ES module syntax?

Yes. import ipaddrJs from "ipaddr.js" 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 ipaddr.js work in Bun?

Yes. import "ipaddr.js" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does ipaddr.js ship TypeScript types?

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

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