Utilities, Dates & Helpers

date-fns

date-fns/date-fns

Popular

Modular, immutable date utility functions with first-class time zone support; tree-shakes well.

Day.js

iamkun/dayjs

Popular

2 kB Moment-compatible date library with an immutable API and plugins.

Luxon

moment/luxon

Immutable date/time library built on the Intl API with strong time zone handling.

Temporal Polyfill

fullcalendar/temporal-polyfill

Trending (detected automatically)Rising

Lightweight polyfill for the new built-in Temporal date/time API while browser support rolls out.

Moment.js

moment/moment

Legacy

The original JS date library, now in maintenance mode; use date-fns, Day.js, Luxon or Temporal.

Lodash

lodash/lodash

Legacy

Ubiquitous utility belt for arrays, objects and functions; often replaced by native APIs or es-toolkit.

es-toolkit

toss/es-toolkit

Trending

Modern, faster and smaller Lodash alternative with a Lodash-compatible compat layer.

clsx

lukeed/clsx

Popular

Tiny utility for constructing conditional className strings.

tailwind-merge

dcastil/tailwind-merge

Popular

Merges Tailwind CSS classes without style conflicts; paired with clsx in the shadcn cn() helper.

class-variance-authority

joe-bell/cva

Type-safe variant API (cva) for building component class names with Tailwind or plain CSS.

Nano ID

ai/nanoid

Tiny, secure, URL-friendly unique string ID generator.

Immer

immerjs/immer

Write immutable updates with plain mutations via structural-sharing proxies; built into Redux Toolkit.