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    The 1kb client side MV* library
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    Riot logo

    Simple and elegant component-based UI library

    Build Status MIT License Join the discord community channel Join the chat (ja) at OpenCollective Backers OpenCollective Sponsors

    NPM version NPM downloads jsDelivr Hits Coverage Status Riot Size Code Quality

    Sauce Test Status

    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

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

    Open this example on Plunker


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


    Custom components let you build complex views with HTML.

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

    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

    Powerful and modular ecosystem

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

    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. 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 && 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 dev branch making sure you have read our pull request template

    6) Be patient


    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


    Support us with a monthly donation and help us continue our activities. Become a backer



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    Special thanks to Browserstack and JetBrains for their support

    jetbrains browser stack
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