capricorn86/happy-dom

Health v2 · maintenance only

Adoption not part of the score

4619 stars · 314 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface, providing a DOM implementation for Node.js and Bun. It is commonly used as a test environment for frontend frameworks and testing libraries like Vitest, Jest, and Testing Library.

Use cases

• test React components in Jest without a real browser
• run Vitest tests with a DOM environment
• parse and manipulate HTML in Node.js
• test web components with Custom Elements and Shadow DOM support
• scrape web pages by parsing HTML with a DOM API
• test Vue, Svelte, or Angular components headlessly

When to choose

• you need a fast, lightweight DOM for unit tests instead of a full headless browser
• you want Custom Elements, Shadow DOM, Mutation Observer, or Fetch API support in tests
• you use Testing Library with Vitest, Jest, or Bun

When to avoid

• you need real browser rendering, layout, or full JavaScript engine behavior
• you need pixel-accurate screenshots or end-to-end browser automation
• your code depends on browser APIs Happy DOM does not implement

Facets

library · maturity active

testing parser http-client web-scraping web-development testing frontend developer-tools bun headless-browser dom-implementation web-components shadow-dom vitest jest testing-library whatwg nodejs javascript typescript

Member repositories

For agents

markdown · JSON · MCP: product_card(name="capricorn86/happy-dom")