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fetch-undici-polyfill

library1.2.1jsnpmunverified

Polyfill for the global fetch API in Node.js using the undici HTTP client. Version 1.2.1, stable. Provides a lightweight, standards-compliant fetch implementation for Node.js versions that lack it, with automatic proxy support via environment variables. Different from other fetch polyfills by being based on undici, which is the official Node.js HTTP client for HTTP/1.1 and HTTP/2.

devops

npm install fetch-undici-polyfill

github ↗package ↗homepage ↗

INSTALL

IMPORT

SIG · FETCH-UNDICI-POLYF

fetch-undici-polyfill

devopsjavascriptv1.2.1

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

void

✓ import 'fetch-undici-polyfill'

✗ import fetch from 'fetch-undici-polyfill'

Side-effect import: polyfills global fetch, no exports.

void

✓ require('fetch-undici-polyfill')

✗ const fetch = require('fetch-undici-polyfill')

CJS require also side-effect only.

global fetch

✓ fetch('https://example.com')

✗ globalThis.fetch('...')

fetch is added to global scope automatically.

Demonstrates importing the polyfill as a side-effect and using the global fetch to make an HTTP request.

import 'fetch-undici-polyfill'; async function main() { const response = await fetch('https://jsonplaceholder.typicode.com/posts/1'); const data = await response.json(); console.log(data); } main().catch(console.error);

Debug

Known issues

gotchaImport is a side-effect, not a default export. Do not assign to variable.

fix

Use `import 'fetch-undici-polyfill'` without assignment.

affects: >=1.0.0

gotchaOnly polyfills fetch in Node.js, not browser. No effect in browser environments.

fix

Use only in Node.js scripts; for browser, use native fetch or a different polyfill.

affects: >=1.0.0

deprecatedUndici v6 made breaking changes. Ensure compatible version installed.

fix

Pin undici to v5 if using older node versions, or update to latest fetch-undici-polyfill.

affects: >=1.0.0

Errors

Common errors & fixes

Error: Cannot find module 'undici'

undici is a peer dependency not installed

fix

Run `npm install undici` to install the required peer dependency.

ReferenceError: fetch is not defined

Polyfill not imported before use

fix

Add `import 'fetch-undici-polyfill'` at the top of your entry file.

Upgrade

Version history

1.2.1latest on npm

Audit

Dependencies

undicirequiredCore HTTP client used for fetch implementation

Agent activity

2 hits · last 30 days

node

Resources

githubhttps://github.com/coveooss/fetch-undici-polyfill ↗

packagefetch-undici-polyfill ↗

homepagehttps://github.com/coveooss/fetch-undici-polyfill#readme ↗