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Is koa-router ESM-only? Can you require() it?

Router middleware for koa. Maintained by Forward Email and Lad.

Last verified Sep 9, 2026 against koa-router@14.0.0. Markdown · JSON

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

koa-router ships CommonJS only. require("koa-router") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 20. import "koa-router" 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("koa-router") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 20.
  2. From ES modules use the default import: import koaRouter from "koa-router"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/koa-router
  4. This package is deprecated: Please use @koa/router instead, starting from v9!
Latest
14.0.0 (Aug 2, 2025)
Module format
CommonJS
Last CommonJS version
14.0.0
TypeScript types
@types/koa-router
Node engines
>= 20
Weekly downloads
1.2M
License
MIT

Deprecated: Please use @koa/router instead, starting from v9!

Does koa-router@14.0.0 actually load? Runtime test results

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

Runtimerequire("koa-router")import "koa-router"
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 koa-router

ES modules (import)

import koaRouter from "koa-router";

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 koaRouter = require("koa-router");

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 (92 versions; the newest 60 shown).

VersionsFormatFirst published
3.1.4 – 14.0.0CommonJSMay 12, 2014

Frequently asked

Is koa-router ESM-only?

koa-router@14.0.0 is a CommonJS package. koa-router ships CommonJS only. require("koa-router") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 20. import "koa-router" 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 koa-router with ES module syntax?

Yes. import koaRouter from "koa-router" 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 koa-router work in Bun?

Yes. import "koa-router" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

Does koa-router ship TypeScript types?

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

Links

Other commonjs packages

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