riot/riot

Simple and elegant component-based UI library

Source code at GitHub https://riot.js.org

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  "createdAt": "2013-09-27T05:21:01Z",
  "defaultBranch": "main",
  "description": "Simple and elegant component-based UI library",
  "fullName": "riot/riot",
  "homepage": "https://riot.js.org",
  "language": "JavaScript",
  "name": "riot",
  "pushedAt": "2025-11-21T22:08:12Z",
  "stargazersCount": 14867,
  "topics": [
    "client-side",
    "customelement",
    "customelements",
    "customtags",
    "elegant",
    "framework",
    "javascript",
    "lite",
    "minimal",
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    "view",
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  ],
  "updatedAt": "2025-11-25T21:32:16Z",
  "url": "https://github.com/riot/riot"
}

Simple and elegant component-based UI library

[![Build Status][ci-image]][ci-url] [![MIT License][license-image]][license-url] [![Join the discord community channel][discord-image]][discord-url] [![Join the chat (ja) at https://riot-jp-slackin.herokuapp.com/][slack-ja-image]][slack-ja-url] [![OpenCollective Backers][backer-badge]][backer-url] [![OpenCollective Sponsors][sponsor-badge]][sponsor-url]

[![NPM version][npm-version-image]][npm-url] [![NPM downloads][npm-downloads-image]][npm-url] [![jsDelivr Hits][jsdelivr-image]][jsdelivr-url] [![Coverage Status][coverage-image]][coverage-url] ![Riot Size][lib-size] [![Code Quality][qlty-image]][qlty-url]

[![Sauce Test Status][saucelabs-image]][saucelabs-url]

Custom components • Concise syntax • Simple API • Tiny Size

Riot brings custom components to all modern browsers. It is designed to offer you everything you wished the native web components API provided.

Tag definition

<timer>
  <p>Seconds Elapsed: { state.time }</p>

  <script>
    export default {
      tick() {
        this.update({ time: ++this.state.time })
      },
      onBeforeMount(props) {
        // create the component initial state
        this.state = {
          time: props.start,
        }

        this.timer = setInterval(this.tick, 1000)
      },
      onUnmounted() {
        clearInterval(this.timer)
      },
    }
  </script>
</timer>

Open this example on Plunker

Mounting

// mount the timer with its initial props
riot.mount('timer', { start: 0 })

Nesting

Custom components let you build complex views with HTML.

<timetable>
  <timer start="0"></timer>
  <timer start="10"></timer>
  <timer start="20"></timer>
</timetable>

HTML syntax is the de facto language on the web and it’s designed for building user interfaces. The syntax is explicit, nesting is inherent to the language and attributes offer a clean way to provide options for custom tags.

Performant and predictable

Absolutely the smallest possible amount of DOM updates and reflows.
Fast expressions bindings instead of virtual DOM memory performance issues and drawbacks.
One way data flow: updates and unmounts are propagated downwards from parent to children.
No “magic” or “smart” reactive properties or hooks
Expressions are pre-compiled and cached for high performance.
Lifecycle methods for more control.

Close to standards

No proprietary event system.
Future proof thanks to the javascript module syntax.
The rendered DOM can be freely manipulated with other tools.
No extra HTML root elements, data- attributes or fancy custom attributes.
No new syntax to learn.
Plays well with any frontend framework.

Use your dearest language and tools

Create components with CoffeeScript, Jade, LiveScript, Typescript, ES6 or any pre-processor you want.
Build with @riotjs/cli, webpack, Rollup, parcel, Browserify.
Test however you like; you can load your riot tags directly in node

Powerful and modular ecosystem

The Riot.js ecosystem is completely modular, it’s designed to let you pick only the stuff you really need:

@riotjs/cli - CLI to locally compile your tags to javascript
@riotjs/ssr - Super simple server side rendering
@riotjs/hydrate - Hydration strategy for your SPA
@riotjs/route - Isomorphic router
@riotjs/lazy - Lazy components loader
@riotjs/hot-reload - Live reload plugin
@riotjs/compiler - Advanced tags compiler
@riotjs/parser - HTML parser
@riotjs/dom-bindings - Expressions based template engine
@riotjs/custom-elements - native custom elements implementation

CDN hosting

How to contribute

If you are reading this it’s already a good sign and I am thankful for it! I try my best working as much as I can on riot but your help is always appreciated.

If you want to contribute to riot helping the project maintenance please check first the list of open issues to understand whether there is a task where you could help.

Riot is mainly developed on UNIX systems so you will be able to run all the commands necessary to build and test the library using our [Makefile]!(Makefile). If you are on a Microsoft machine it could be harder to set up your development environment properly.

Following the steps below you should be able to properly submit your patch to the project

1) Clone the repo and browse to the riot folder

git clone git@github.com:riot/riot.git && cd riot

2) Set up your git branch

git checkout -b feature/my-awesome-patch

3) Install the npm dependencies

npm i

4) Build and test riot using the Makefile

# To build and test riot
$ make riot

# To build without testing
$ make raw

5) Pull request only against the `main` branch making sure you have read [our pull request template]!(.github/PULL_REQUEST_TEMPLATE.md)

6) Be patient

Credits

Riot is actively maintained with :heart: by:

Gianluca Guarini

Many thanks to all smart people from all over the world who helped improving it.

Official Website

https://riot.js.org

Backers

Support us with a monthly donation and help us continue our activities. [Become a backer][support-url]

[![Backers][backers-image]][support-url]

Thanks

Special thanks to Browserstack for their support

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riot/riot

Simple and elegant component-based UI library

Custom components • Concise syntax • Simple API • Tiny Size

Tag definition

Mounting

Nesting

Performant and predictable

Close to standards

Use your dearest language and tools

Powerful and modular ecosystem

CDN hosting

How to contribute

1) Clone the repo and browse to the riot folder

2) Set up your git branch

3) Install the npm dependencies

4) Build and test riot using the Makefile

5) Pull request only against the main branch making sure you have read [our pull request template]!(.github/PULL_REQUEST_TEMPLATE.md)

6) Be patient

Credits

Official Website

Backers

Sponsors

Thanks

5) Pull request only against the `main` branch making sure you have read [our pull request template]!(.github/PULL_REQUEST_TEMPLATE.md)