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

2KB immutable date time library alternative to Moment.js with the same modern API

Last verified Sep 9, 2026 against dayjs@1.11.23. Markdown · JSON

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

dayjs ships CommonJS only. require("dayjs") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "dayjs" 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("dayjs") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
  2. From ES modules use the default import: import dayjs from "dayjs"; then destructure. Named imports only work when Node.js can statically detect the exports.
  3. TypeScript: types are bundled; install nothing extra.
Latest
1.11.23 (Aug 17, 2026)
Module format
CommonJS
Last CommonJS version
1.11.23
TypeScript types
Bundled
Node engines
not declared
Weekly downloads
48.7M
License
MIT

Does dayjs@1.11.23 actually load? Runtime test results

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

Runtimerequire("dayjs")import "dayjs"
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 dayjs

ES modules (import)

import dayjs from "dayjs";

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 dayjs = require("dayjs");

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 (132 versions; the newest 60 shown).

VersionsFormatFirst published
1.8.19 – 1.11.23CommonJSJan 6, 2020

Frequently asked

Is dayjs ESM-only?

dayjs@1.11.23 is a CommonJS package. dayjs ships CommonJS only. require("dayjs") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "dayjs" 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 dayjs with ES module syntax?

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

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

Does dayjs ship TypeScript types?

Yes. dayjs bundles its own type declarations; no @types package is needed.

Links

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