canirequire › CommonJS › dayjs
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. JSON
CommonJS CommonJS — require() works on every Node.js version
dayjs ships CommonJS only. require("dayjs") works everywhere. 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.
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.
| Runtime | require("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 | ✓ 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 (132 versions; the newest 60 shown).
| Versions | Format | First published |
|---|---|---|
| 1.8.19 – 1.11.23 | CommonJS | Jan 6, 2020 |
Frequently asked
Is dayjs ESM-only?
dayjs@1.11.23 is a CommonJS package. dayjs ships CommonJS only. require("dayjs") works everywhere. 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 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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