happy-dom
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A JavaScript implementation of a web browser without its graphical user interface.
Custom Elements (Web Components)
Declarative Shadow DOM
Mutation Observer
Tree Walker
Fetch API
And much more..
Documentation | Getting Started | Setup as Test Environment | GitHub
Vitest | Bun | Jest | Testing Library | Google LitElement | Vue | React | Svelte | Angular
| 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
FAQs
Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. It includes many web standards from WHATWG DOM and HTML.
The npm package happy-dom receives a total of 637,049 weekly downloads. As such, happy-dom popularity was classified as popular.
We found that happy-dom demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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Research
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