preact

React-like API (pre-hooks). Cool ecosystem of similarly tiny tools and components. Highly recommended.

hyperapp

vDOM framework with pure JS syntax and immutable state,

redom

Hyperapp-style templates with imperative event listeners and updates,

fre

React-like library with hooks and concurrency,

van

vDOM-based framework optimized for no-build setups,

superfine

Hyperapp with state & effect hooks removed,

arrowjs

Tagged templates + reactive data,

umbrella

jQuery-style DOM manipulation library,

mitt

Plain event emitter that I use on most projects,

nanoevents

Nicer unsubscribe API, but no * event,

onfire.js

Also has .once method,

zustand

Simple stores with pleasant actions and selectors. Vanilla , React

nanostores

Modular store with good tree-shaking support, vanilla, + React extra. Supports all the top frameworks.

exome

Atomic stores with lots of framework connectors, + React extra. Supports all the top frameworks.

storeon

Minimal redux-styled store with lots of framework connectors, . React extra + Vue, Svelte, Angular.

unistore

Centralized store with actions, + React

teaful

Store with useState-like API, , including React / preact connector.

@preact/signals

The OG signals from preact core, with react integration.

usignal

A smaller signal implementation,

hyperactiv

4 functions to make objects observable and listen to changes,

flimsy

Signals from Solid (it almost fit into UI frameworks category itself). Author warning: it's probably buggy.

flyd

Rx-styled event streams,

callbag-basics

Rx-style event streams,

wouter

Declarative router for React / preact, , also available as a standalone hook:

@nanostores/router

Routes as a nanostores store (framework-agnostic),

navaid

History-based observable router,

matchit

Route parser and matcher in

regexparam

Convert path to regexp in

qss

Parse querystrings in . Not sure you need it, URL API support is good.

redaxios

Drop-in axios replacement for modern browsers,

wretch

Chainable API with error processing and lots of extra plugins,

gretchen

Chainable API with type-safe errors,

unfetch

Loose fetch polyfill,

@nanostores/i18n

Detect locale, load dictionaries, format dates / numbers, including nanostores.

eo-locale

Interpolation and dates / numbers, , or with react bindings.

rosetta

Bare-bones template strings ({{hello}}, {{username}}) and custom functions for everyting else,

lingui

Small core with template strings,

date-fns

Not tiny as a whole, but most functions are under 1 kB each (format and parse are quite heavy).

dayjs

Almost moment.js-compatible API, covers most use cases,

tinytime

Simple date / time formatter: {h}:{mm} -> 9:33,

tinydate

Date / time formatter, only supports padded numeric output (September -> 09),

time-stamp

More of the same,

ms

Parse & format ms durations, e.g. "1m" <-> 60000,

timeago.js

Format dates into stuff like X minutes ago or in X hours,

fromnow

More of the same,

remeda

90 tree-shakable helpers (list).

rambda

187 tree-shakable helpers (list).

just

82 helpers in separate packages (list).

@fxts/core

96 tree-shakable helpers. Lazy evaluation support.

v8n

zod-style API with fine-grained checks: v8n().string().minLength(5).first("H").last("o"). No tree shaking,

banditypes

The smallest validation library:

superstruct

The most popular modular validation library with good tree-shaking,

valibot

Another modular validation library,

deep-waters

Composable functional validators, .

@lukeed/uuid

Real UUIDs,

nanoid

Random IDs with larger alphabet,

uid

More of the same,

hexoid

Hexadecimal IDs,

colord

Manipulate colors and convert between spaces, . Extra features come as plugins, 150b to 1.5 kB each.

colr

More of the same,

polychrome

More of the same,

randomcolor

Attractive random colors with configuration.

alloyfinger

Pan, swipe, tap, doubletap, longpress, and pinch / rotate. My personal favorite. .

tinygesture

Configurable pan, swipe, tap, doubletap, longpress. .

pointer-tracker

Unified interface for mouse, touch and pointer events,

detect-it

Detect present and primary input method (touch / mouse) and supported events,

js-search

Feature-rich and customizable: multi-field indices, stop words, custom stemmers and tokenizers.

ndx

Similar to js-search, differs in ranking and is less strict for multi-word queries (compare). Supports field weights.

wade

Also similar, (compare)

libsearch

Index-free search (slower, but easier to use) with sane ordering

stemmer

porter-stemmer

fuzzy

Index-free, can highlight matches.

fuzzy-search

With stateful index.

fzy.js

Matches one string at a time, tree-shakeable scores and match highlighting. total, or ~150 bytes for hasMatch only.

fuzzysearch

One string at a time, does not compute score / rank.

liquidmetal

Quicksilver algorithm, prioritizes matches at start of word for command abbreviations (e.g. gp -> git push). One string at a time.

quick-score

Another quicksilver-based lib, tweaked for long strings. Built-in list filtering and sorting, or 1.2 kB for single-string scoring.

fuzzyset

Find misspellings, e.g. missipissi -> Missisipi, Commercial usage costs $42.