unjs

UnJS (Unified JavaScript) is an ecosystem of high-quality, single-purpose JavaScript libraries and tools designed to work together and independently across any environment. These skills cover the core packages and their practical usage patterns for building universal JavaScript applications.

The skill is based on UnJS website, generated at 2026-01-31.

Core References

HTTP & Server

Topic	Description	Reference
H3 Framework	Minimal HTTP framework for high performance and portability	core-h3
Nitro Server	Universal web server framework that runs anywhere	core-nitro
Listhen	Elegant HTTP listener for Node.js and edge environments	core-listhen

Utilities

Topic	Description	Reference
Defu	Recursive default property assignment	core-defu
Destr	Fast and secure JSON.parse alternative	core-destr
Ohash	Fast hashing library based on murmurhash3	core-ohash
Pathe	Cross-platform path utilities (Node.js path replacement)	core-pathe
UFO	URL utilities for parsing, formatting, and manipulation	core-ufo
Scule	String case conversion utilities (camelCase, kebab-case, etc.)	core-scule

Build Tools

Topic	Description	Reference
Unbuild	Unified JavaScript build system	core-unbuild
Mkdist	Generate distribution files from source	core-mkdist
Unplugin	Unified plugin system for Vite, Rollup, webpack, esbuild, and more	core-unplugin

Features

Storage & Data

Topic	Description	Reference
Unstorage	Async key-value storage API with multiple drivers	features-unstorage

Environment & Runtime

Topic	Description	Reference
Unenv	Convert JavaScript code to be runtime agnostic	features-unenv
Std-env	Standard environment variables utilities	features-std-env

HTTP Client

Topic	Description	Reference
Ofetch	Better fetch API for Node.js, browser, and workers	features-ofetch

Routing

Topic	Description	Reference
Radix3	Lightweight and fast router based on Radix Tree	features-radix3

CLI & Tools

Topic	Description	Reference
Citty	Elegant CLI builder with type-safe commands	features-citty
Giget	Download templates and git repositories	features-giget

Hooks & Context

Topic	Description	Reference
Hookable	Awaitable hooks system for plugins and extensions	features-hookable
Unctx	Composables pattern in vanilla JavaScript	features-unctx

Crypto & Security

Topic	Description	Reference
Uncrypto	Universal crypto API for Node.js, browser, and edge	features-uncrypto

Module System

Topic	Description	Reference
Mlly	ECMAScript module utilities for Node.js	features-mlly
Unimport	Auto-import APIs in modules	features-unimport

Type System

Topic	Description	Reference
Untyped	Generate types and markdown from config objects	features-untyped

Logging & Console

Topic	Description	Reference
Consola	Elegant console wrapper with multiple reporters	features-consola

Documentation & Markdown

Topic	Description	Reference
Automd	Automated markdown maintainer	features-automd
Changelogen	Generate beautiful changelogs using conventional commits	features-changelogen
Mdbox	Simple markdown utilities	features-mdbox
Undocs	Minimal documentation theme and CLI for UnJS projects	features-undocs

Configuration

Topic	Description	Reference
C12	Smart configuration loader	features-c12
Confbox	Compact and high quality YAML, TOML, JSONC and JSON5 parsers	features-confbox
Rc9	Read/write config couldn't be easier	features-rc9

HTTP & WebSocket

Topic	Description	Reference
Httpxy	Full-featured HTTP and WebSocket proxy for Node.js	features-httpxy
Crossws	Cross-platform WebSocket servers for Node.js, Deno, Bun and Cloudflare Workers	features-crossws
Cookie-es	ESM cookie serializer and deserializer	features-cookie-es

Image Processing

Topic	Description	Reference
IPX	High performance, secure and easy to use image proxy based on Sharp and libvips	features-ipx
Image-meta	Detect image type and size using pure JavaScript	features-image-meta
Jimp-compact	Lightweight version of Jimp - image processing library	features-jimp-compact
Fontaine	Automatic font fallback based on font metrics	features-fontaine

Code Generation & AST

Topic	Description	Reference
Magicast	Programmatically modify JavaScript and TypeScript source codes	features-magicast
Magic-regexp	A compiled-away, type-safe, readable RegExp alternative	features-magic-regexp
Knitwork-X	Utilities to generate safe JavaScript code (actively maintained fork)	features-knitwork
Jiti	Runtime TypeScript and ESM support for Node.js	features-jiti

Database & Storage

Topic	Description	Reference
Db0	Lightweight SQL connector	features-db0
Mongoz	Zero config MongoDB server	features-mongoz

Utilities

Topic	Description	Reference
Fs-memo	Easy persisted memo object for Node.js	features-fs-memo
Get-port-please	Get an available open port	features-get-port-please
Perfect-debounce	Debounce promise-returning and async functions	features-perfect-debounce
Serve-placeholder	Smart placeholder for missing assets	features-serve-placeholder
Theme-colors	Easily generate color shades for themes	features-theme-colors

Package Management

Topic	Description	Reference
Nypm	Unified package manager for Node.js	features-nypm
Pkg-types	Node.js utilities and TypeScript definitions for package.json and tsconfig.json	features-pkg-types
Bundle-runner	Run webpack bundles in Node.js with optional VM sandboxing	features-bundle-runner

Web APIs

Topic	Description	Reference
Unhead	Universal document head tag manager	features-unhead
Ungh	Unlimited access to GitHub API	features-ungh
Unpdf	Utilities to work with PDFs in Node.js, browser and workers	features-unpdf
Unwasm	WebAssembly tools for JavaScript	features-unwasm
Uqr	Generate QR Code universally, in any runtime, to ANSI, Unicode or SVG	features-uqr
Untun	Tunnel your local HTTP(s) server to the world powered by Cloudflare Quick Tunnels	features-untun
Node-fetch-native	A better redistribution of node-fetch	features-node-fetch-native

Build Tools (Additional)

Topic	Description	Reference
Webpackbar	Elegant progress bar and profiler for webpack 3, 4 and 5	features-webpackbar
Nanotar	Tiny and fast Tar utils for any JavaScript runtime	features-nanotar