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

Node.js final http responder

Last verified Sep 9, 2026 against finalhandler@2.1.1. Markdown · JSON

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

finalhandler ships CommonJS only. require("finalhandler") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.0.0. import "finalhandler" 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("finalhandler") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.0.0.
  2. From ES modules use the default import: import finalhandler from "finalhandler"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: npm install -D @types/finalhandler
Latest
2.1.1 (Dec 1, 2025)
Module format
CommonJS
Last CommonJS version
2.1.1
TypeScript types
@types/finalhandler
Node engines
>= 18.0.0
Weekly downloads
132.1M
License
MIT

Does finalhandler@2.1.1 actually load? Runtime test results

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

Runtimerequire("finalhandler")import "finalhandler"
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 finalhandler

ES modules (import)

import finalhandler from "finalhandler";

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 finalhandler = require("finalhandler");

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 (35 versions; the newest 35 shown).

VersionsFormatFirst published
0.0.0 – 2.1.1CommonJSJun 6, 2014

Frequently asked

Is finalhandler ESM-only?

finalhandler@2.1.1 is a CommonJS package. finalhandler ships CommonJS only. require("finalhandler") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. The package declares Node.js >= 18.0.0. import "finalhandler" 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 finalhandler with ES module syntax?

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

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

Does finalhandler ship TypeScript types?

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

Links

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