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Is isomorphic-fetch ESM-only? Can you require() it?

Isomorphic WHATWG Fetch API, for Node & Browserify

Last verified Sep 9, 2026 against isomorphic-fetch@3.0.0. JSON

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

isomorphic-fetch ships CommonJS only. require("isomorphic-fetch") works everywhere. import "isomorphic-fetch" 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
3.0.0 (Sep 23, 2020)
Module format
CommonJS
Last CommonJS version
3.0.0
TypeScript types
@types/isomorphic-fetch
Node engines
not declared
Weekly downloads
9.8M
License
MIT

Does isomorphic-fetch@3.0.0 actually load? Runtime test results

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

Runtimerequire("isomorphic-fetch")import "isomorphic-fetch"
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 isomorphic-fetch

ES modules (import)

import isomorphicFetch from "isomorphic-fetch";

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 isomorphicFetch = require("isomorphic-fetch");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (23 versions; the newest 23 shown).

VersionsFormatFirst published
1.0.0 – 3.0.0CommonJSNov 7, 2014

Frequently asked

Is isomorphic-fetch ESM-only?

isomorphic-fetch@3.0.0 is a CommonJS package. isomorphic-fetch ships CommonJS only. require("isomorphic-fetch") works everywhere. import "isomorphic-fetch" 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 isomorphic-fetch with ES module syntax?

Yes. import isomorphicFetch from "isomorphic-fetch" 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 isomorphic-fetch work in Bun?

Yes. import "isomorphic-fetch" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does isomorphic-fetch ship TypeScript types?

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

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