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headers-polyfill

npmv5.0.1

A native "Headers" class polyfill.

Safe to adopt

Yes — headers-polyfill scores well across adoption, maintenance, weight, supply chain, and licensing. 13.6M downloads per week and 1 known dependents. Last published 188 days ago. 2 releases in the last 2 years.

  • AAdoption: grade A, Excellent.

    13.6M downloads per week and 1 known dependents.

  • BMaintenance: grade B, Good.

    Last published 188 days ago. 2 releases in the last 2 years.

  • AWeight: grade A, Excellent.

    Pulls in 4 transitive packages, about 2.7 MB installed.

  • BSupply chain: grade B, Good.

    This package has a single maintainer (bus factor of 1).

  • ALicense: grade A, Excellent.

    MIT — permissive, with no copyleft found in the dependency tree.

Grades are computed deterministically from registry metadata collected by PackageGraph — downloads, dependents, publish dates, the resolved dependency tree, maintainer count, and declared licenses. No third-party scores are used.

Install cost

What you actually take on by adding headers-polyfill to a project.

2
Direct dependencies

Runtime packages this one declares itself.

4
Total installed

Distinct packages in the full runtime tree, deduplicated the way a package manager would.

2.7 MB
Install size

Unpacked size of this package plus its entire runtime tree.

3
Tree depth

Longest resolved dependency chain below this package.

Licenses in the dependency tree

MIT

Every license you inherit by installing headers-polyfill, not just its own. Check this before a legal review, not after.

Compatibility

Node.js
No constraint declared
Module format
ESM + CommonJS
TypeScript
No bundled types
Install scripts
None

Quick start

A usage example from the headers-polyfill README.

jsFull README ↗
import { Headers } from 'headers-polyfill'

const headers = new Headers({
  Accept: '*/*',
  'Content-Type': 'application/json',
})

headers.get('accept') // "*/*"

Dependencies

Declared by headers-polyfill v5.0.1. Runtime dependencies are installed with the package; dev dependencies are not.

Runtime (2)

@types/set-cookie-parser ^2.4.10set-cookie-parser ^3.0.1

Dev (6)

@ossjs/release ^0.10.1jsdom ^28.1.0publint ^0.3.18tsdown ^0.21.0typescript ^5.9.3vitest ^4.0.18

Used by

Popular packages that depend on headers-polyfill.

mswnpm

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Relationship graph

Dependencies (left) and dependents (right) of headers-polyfill.

@types/set-cookie…set-cookie-parsermswheaders-polyfill
headers-polyfill dependencies dependents

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Release history

2 releases in the last two years, typically about 5 days apart.

Recent versions of headers-polyfill
VersionPublishedSizeLicense
5.0.1latest6 months ago110 KBMIT
5.0.06 months ago110 KBMIT
4.0.32 years ago131 KBMIT
4.0.22 years ago130 KBMIT
4.0.13 years ago130 KBMIT
4.0.03 years ago130 KBMIT
3.3.03 years ago130 KBMIT
3.2.53 years ago125 KBMIT
3.2.43 years ago114 KBMIT
3.2.33 years ago109 KBMIT
3.2.23 years ago89 KBMIT
3.2.13 years ago56 KBMIT
3.2.03 years ago55 KBMIT
3.1.23 years ago53 KBMIT
3.1.13 years ago53 KBMIT

Overview

headers-polyfill is an npm package that a native "Headers" class polyfill. It is extremely widely used, with about 13.6M downloads per week and 1 known dependents in the graph. The latest version is 5.0.1, released under the MIT license.

Who should use it

Teams working in the npm ecosystem who need a native "Headers" class polyfill and value a battle-tested, widely-adopted solution.

When not to use it

Consider an alternative if you need to have first-class TypeScript types out of the box, or if a more actively-maintained option better fits your npm stack.

Pros

  • Large, well-established user base (13.6M weekly downloads).
  • Clear open-source license (MIT).

Cons

  • No bundled TypeScript types (may require a separate @types package).

Auto-generated from collected registry metadata. No external claims are inferred.

Maintainers

kettanaito

Frequently asked questions

Should I use headers-polyfill?

Yes — headers-polyfill scores well across adoption, maintenance, weight, supply chain, and licensing. 13.6M downloads per week and 1 known dependents. Last published 188 days ago. 2 releases in the last 2 years.

How do I install headers-polyfill?

Run `npm install headers-polyfill` to add headers-polyfill to your npm project.

How many dependencies does headers-polyfill have?

headers-polyfill declares 8 direct dependencies and pulls in 4 packages in total once its runtime tree is resolved totalling about 2.7 MB on disk.

What license is headers-polyfill released under?

headers-polyfill is distributed under the MIT license.

How popular is headers-polyfill?

headers-polyfill has approximately 13,642,064 downloads per week and 1 known dependent packages.

Is headers-polyfill still maintained?

The most recent release of headers-polyfill (v5.0.1) was published 6 months ago.

Does headers-polyfill run install scripts?

No. headers-polyfill does not define preinstall, install, or postinstall scripts, so installing it does not execute publisher-supplied code.