happy-dom

A JavaScript implementation of a web browser without its graphical user interface.

DOM Features

• Custom Elements (Web Components)

• Declarative Shadow DOM

• Mutation Observer

• Tree Walker

• Fetch API

And much more..

Documentation

Documentation | Getting Started | Setup as Test Environment | GitHub

Works With

Vitest | Bun | Jest | Testing Library | Google LitElement | Vue | React | Svelte | Angular

Module Systems

ESM | CommonJS

Performance

Operation	JSDOM	Happy DOM
Import / Require	333 ms	45 ms
Parse HTML	256 ms	26 ms
Serialize HTML	65 ms	8 ms
Render custom element	214 ms	19 ms
querySelectorAll('tagname')	4.9 ms	0.7 ms
querySelectorAll(':nth-child(2n+1)')	10.4 ms	3.8 ms

See how the test was done here

Similar packages

Other packages similar to happy-dom

jsdom

jsdom is another popular DOM implementation for Node.js. It provides a more complete and detailed implementation of the DOM and other web standards. However, it is generally slower and more resource-intensive compared to happy-dom.

cheerio

cheerio is a fast, flexible, and lean implementation of core jQuery designed specifically for the server. It is not a full DOM implementation but provides a subset of jQuery functionality for parsing and manipulating HTML. It is faster and more lightweight than jsdom but less feature-rich.

linkedom

linkedom is a lightweight and fast DOM implementation for Node.js. It aims to be a minimalistic alternative to jsdom, providing essential DOM functionalities with better performance. It is similar to happy-dom in terms of performance and use cases.