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capricorn86/happy-dom

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

4,634

stars

2,316

commits

TypeScript

primary language

Sep 3, 2026

updated

angular
browser
bun
dom
hacktoberfest
hacktoberfest2025
html
javascript
jest
lit-element
lit-html
nodejs
react
svelte
testing-library
typescript
vitest
vue
web-components
whatwg

README

Happy DOM Logo

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

Published on NPM

Documentation | Getting started | Setup as Test Environment

DOM Features

  • Custom Elements (Web Components)

  • Declarative Shadow DOM

  • Mutation Observer

  • Tree Walker

  • Fetch API

And much more..

Works With

Sponsors

Sponsors

Sentry    Canonical    Canonical

Contributing

See Contributing Guide.

License

MIT License © 2019-Present David Ortner

Contributors

(top 30 of 166)

capricorn86

1,770 commits

Mas0nShi

79 commits

btea

58 commits

TrevorBurnham

27 commits

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Languages

TypeScript

99.1%

capricorn86/happy-dom

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

4,634

stars

2,316

commits

TypeScript

primary language

Sep 3, 2026

updated

angular
browser
bun
dom
hacktoberfest
hacktoberfest2025
html
javascript
jest
lit-element
lit-html
nodejs
react
svelte
testing-library
typescript
vitest
vue
web-components
whatwg

README

Happy DOM Logo

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

Published on NPM

Documentation | Getting started | Setup as Test Environment

DOM Features

  • Custom Elements (Web Components)

  • Declarative Shadow DOM

  • Mutation Observer

  • Tree Walker

  • Fetch API

And much more..

Works With

Sponsors

Sponsors

Sentry    Canonical    Canonical

Contributing

See Contributing Guide.

License

MIT License © 2019-Present David Ortner

Similar repos

storybooks/storybook

Storybook is the industry standard workshop for building, documenting, and testing UI components in…

91,024

shared topics

storybookjs/storybook

Storybook is the industry standard workshop for building, documenting, and testing UI components in…

91,011

shared topics

lit/lit

Lit is a simple library for building fast, lightweight web components.

21,813

shared topics

rehypejs/rehype-dom

HTML processor to parse and compile with browser APIs, powered by plugins

25

shared topics

testing-library/jest-dom

:owl: Custom jest matchers to test the state of the DOM

4,597

shared topics

preactjs/preact

⚛️ Fast 3kB React alternative with the same modern API. Components & Virtual DOM.

38,853

shared topics

syntax-tree/hast-util-to-dom

utility to transform hast to a DOM tree

21

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syntax-tree/hast-util-from-dom

utility to transform a DOM tree to hast

23

shared topics

Contributors

(top 30 of 166)

capricorn86

1,770 commits

Mas0nShi

79 commits

btea

58 commits

TrevorBurnham

27 commits

Languages

TypeScript

99.1%