Lit

Web components library for fast, interoperable custom elements with reactive properties.

Overview

Lit is a simple, lightweight library for building fast web components. At its core is a component base class that provides reactive state, scoped styles, and a declarative template system—all while keeping bundle size minimal at around 5 KB minified and compressed.

Every Lit component is a standard web component, making them interoperable with any framework or HTML environment. This makes Lit ideal for building shareable components, design systems, or progressively enhancing existing sites. You can also build complete interactive applications with Lit, with comparable capabilities to popular frameworks like React or Vue, but with less lock-in and greater flexibility.

Lit emphasizes developer ergonomics through expressive JavaScript template literals, automatic re-rendering on reactive property changes, and scoped styling via Shadow DOM. The library requires no compilation during development and works with vanilla JavaScript or TypeScript with decorators.

Key features

Reactive properties and automatic re-rendering
Declarative templates using JavaScript template literals
Scoped styles via Shadow DOM
Web Components standard compliance
Tiny 5 KB footprint (minified and compressed)
No compilation required during development
TypeScript and decorator support
Server-side rendering support

Pros

Minimal bundle size keeps loading times short
Native browser interoperability across frameworks
Simple, expressive template syntax
Automatic scoped styling prevents CSS conflicts
No virtual DOM overhead—updates only dynamic parts
Works with vanilla JavaScript or TypeScript
Reduces boilerplate code
Easy to migrate or update components independently

Cons

Requires understanding of Web Components standards
Shadow DOM scoping may require adjustment for some use cases
Smaller ecosystem compared to React or Vue
Limited built-in state management solutions

Use this if

You need lightweight, reusable web components that work across frameworks; you're building a design system; you want to progressively enhance existing HTML; or you prefer minimal bundle sizes and native browser standards.

Skip this if

You need extensive built-in state management; you require a large ecosystem of pre-built components; or you prefer a framework with stronger conventions and scaffolding.

Best for

Building reusable web componentsCreating design systemsProgressive enhancement of HTML sitesBuilding interactive web applicationsCross-framework component libraries

Alternatives

ReactVueWeb Components (vanilla)SvelteStencil

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