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Is http-cache-semantics ESM-only? Can you require() it?

Parses Cache-Control and other headers. Helps building correct HTTP caches and proxies

Last verified Sep 9, 2026 against http-cache-semantics@4.2.0. JSON

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

http-cache-semantics ships CommonJS only. require("http-cache-semantics") works everywhere. import "http-cache-semantics" 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
4.2.0 (May 9, 2025)
Module format
CommonJS
Last CommonJS version
4.2.0
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
43.4M
License
BSD-2-Clause

Does http-cache-semantics@4.2.0 actually load? Runtime test results

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

Runtimerequire("http-cache-semantics")import "http-cache-semantics"
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 http-cache-semantics

ES modules (import)

import httpCacheSemantics from "http-cache-semantics";

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 httpCacheSemantics = require("http-cache-semantics");

Module format by version

Derived from the type, main and exports fields of every stable release on npm (27 versions; the newest 27 shown).

VersionsFormatFirst published
1.0.0 – 4.2.0CommonJSMay 31, 2016

Frequently asked

Is http-cache-semantics ESM-only?

http-cache-semantics@4.2.0 is a CommonJS package. http-cache-semantics ships CommonJS only. require("http-cache-semantics") works everywhere. import "http-cache-semantics" 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 http-cache-semantics with ES module syntax?

Yes. import httpCacheSemantics from "http-cache-semantics" 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 http-cache-semantics work in Bun?

Yes. import "http-cache-semantics" loaded successfully in Bun 1.4 on Sep 9, 2026.

Does http-cache-semantics ship TypeScript types?

Yes. http-cache-semantics bundles its own type declarations; no @types package is needed.

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