Happy DOM

Overview

Happy DOM is a JavaScript DOM implementation for Node.js — 3-10x faster than jsdom. It provides window, document, HTMLElement, and 1000+ Web APIs without launching a browser. Use it as the test environment for Vitest or Jest when testing UI components, or for server-side DOM manipulation (email templates, HTML generation, scraping).

When to Use

• Test environment for React/Vue/Svelte component tests (faster than jsdom)
• Vitest setup — Happy DOM is the recommended environment
• Server-side HTML generation or manipulation
• Parsing and extracting data from HTML strings
• Email template rendering on the server

Instructions

Vitest Integration