-----
id: h3
github: h3
home: /h3/
title: "H3"
site: "https://h3.js.org"
subtitle: "A tiny, extremely minimalist JavaScript microframework"
summary: "A tiny, extremely minimalist JavaScript microframework"
content-type: project
active: true
download: "https://github.com/h3rald/h3/releases/download/"
version: 0.11.0
versionLabel: "Keen Klingon"
docs: /h3/H3_DeveloperGuide.htm
-----

**H3** is a microframework to build client-side single-page applications (SPAs) in modern JavaScript.

H3 is also:

- **tiny**, under [700 sloc](https://github.com/h3rald/h3/blob/master/h3.js).
- **modern**, in the sense that it runs only in modern browsers (latest versions of Chrome, Firefox, Edge & similar).
- **easy** to learn, its API is comprised of only seven methods and two properties.

### I'm sold! Where can I get it?

Here, look, it's just one file:

<a href="https://raw.githubusercontent.com/h3rald/h3/v{{$version}}/h3.js" target="_blank" class="button primary">Download v{{$version}} ({{$versionLabel}})</a>

Yes there is also a [NPM package](https://www.npmjs.com/package/@h3rald/h3) if you want to use it with WebPack and similar, but let me repeat: _it's just one file_.

### Hello, World?

Here's an example of an extremely minimal SPA created with H3:

```js
import { h3, h } from "./h3.js";
h3.init(() => h("h1", "Hello, World!"));
```

This will render a `h1` tag within the document body, containing the text `"Hello, World!"`.

### Something more complex?

Have a look at the code of a [simple todo list](https://github.com/h3rald/h3/tree/master/docs/example) ([demo](https://h3.js.org/example/index.html)) with several components, a store and some routing.