Written by Rob O'Leary✏️

Svelte is a popular component-based frontend framework. Let’s discuss what Svelte is, outline why you might choose it for your next project, cover its key features, and elaborate on what sets Svelte apart from other frameworks.

What is Svelte?

Svelte is a component-based frontend framework. It’s similar to frameworks such as React, Vue, and Angular, which all share the goal of making it easier to build modular, interactive user interfaces.

Svelte is the fourth most popular frontend framework after Angular (third), Vue (second), and React (first). It was voted the most admired JavaScript web framework in the 2023 Stack Overflow Developer Survey. In other words, it’s evident that developers love using Svelte.

Svelte was created by Rich Harris when he was working as a graphics editor at The Guardian newspaper. Rich created the framework out of his own frustration with the frontend framework landscape circa 2015. In 2019, after the release of Svelte 3, it started to gain more traction with frontend developers.

Rich created Svelte as a response to the web's JavaScript bloat crisis. The bundle size of JavaScript frameworks was growing year over year.

The status quo was for everything to be done at runtime in the browser. Frameworks such as React had to be run in the browser alongside the application code, leading to slower loading times and other performance constraints. Svelte took a very different approach, earning its tagline of “the magical disappearing UI framework.”

Fundamentally, Svelte is a compiler. It converts your components into a tiny, framework-less vanilla JavaScript bundle at build time. This approach ensures that you don't incur a heavy penalty when your app first loads, which would happen with other frameworks.

Svelte takes a holistic view of what a developer requires to make a frontend application. The objective is to save you the time it would take to trawl npm for the bare necessities. It has built-in support for scoped styling, form bindings, state management, animations, motion, and more.

Additionally, Svelte has built-in code quality tool called svelte-check that can detect unused CSS and provide accessibility hints.

You can use Svelte to build an app from scratch or add it incrementally to an existing codebase. Although you need to add a preprocessor, you can also use TypeScript within Svelte components.

Since Svelte is a compiler, it’s easy to change output targets without having to change your component’s code. For example, Svelte supports server-side rendering (SSR) out of the box by providing a compiler mode for it.

Svelte also has an official application framework called SvelteKit that is a one-stop shop for building modern, multi-page web apps. It has various integrations that allow you to use the various flavors of JavaScript and CSS, such as TypeScript, PostCSS, SCSS, Less, Stylus, and SugarSS.

Further reading:

• Adding TypeScript to an existing Svelte project

The core characteristics of Svelte

Svelte has three distinguishing characteristics:

• Write less code
• No virtual DOM
• Truly reactive

Let’s discuss how each of these core characteristics benefits developers.

Write less code

Svelte wants developers to be more productive. Reducing the amount of code you have to write is one of its explicit goals. It wants to reduce boilerplate and favor patterns that allow developers to naturally write less code.

One example is state variables. In Svelte, you update local component state with an assignment operator:

let count = 0;
function increment() {    count += 1;}

While in React, you use the useState Hook:

const [count, setCount] = useState(0);
function increment() {    setCount(count + 1);}

Svelte is expressing the exact same concept, but with over 60 percent fewer characters.

Another example is reactive declarations, which essentially do the same work as React's useMemo, useCallback and useEffect Hooks without the boilerplate. This is possible because Svelte is a compiler and isn’t constrained to the peculiarities of JavaScript. The focus is on creating the best component authoring experience, rather than having to fit it around the semantics of the language.

There are several other things that make coding in Svelte more succinct. You can read more about this in the Svelte team’s Write less code article.

No virtual DOM

A core requirement of a frontend framework is the ability to react to state changes in user interfaces. To do this, the application's state needs to be tracked by the framework. When a change is detected, the data and the DOM need to be synchronized.

The challenge is that it’s expensive to frequently re-render the user interface. So, then, how do you minimize re-rendering?

Frameworks such as React started to use a virtual DOM (VDOM) to address this challenge. The VDOM is a programming concept where an ideal representation of a UI is kept in memory and synced with the “real” DOM.

This approach works by re-rendering your entire application to the desired state in the VDOM for each state change. Then, it has the framework work out the minimum number of changes required (diffing) to bring the browser’s actual DOM in line with that desired state (reconciliation).

Although this minimizes re-rendering, the problem with the VDOM is that its operations are performed in addition to the eventual operations on the real DOM. The overhead is high for both CPU and memory usage.

Svelte took a different approach to this problem. It knows at build time how things can change in your app. Instead of keeping an in-memory copy of the DOM, Svelte knows precisely what should be updated and does it directly in the DOM. This proves to be more efficient.

Further reading:

• What is the virtual DOM in React?
• How the virtual DOM works in Vue.js
• Svelte.dev — Virtual DOM is pure overhead

Truly reactive

Reactivity is a first-class citizen in Svelte. Svelte uses compile-time reactivity, using let, =, the export keyword, and the $: label to identify reactive state. Dependents of a variable are determined when Svelte compiles your component. You are mostly writing regular, vanilla JavaScript.

As an app grows in complexity, dealing with shared state between components gets increasingly complex and problematic. You might have more trouble identifying how app-wide state changes cascade to different parts of an app. This becomes easier to track and maintain if we follow design patterns such as the observer pattern, which is where state management libraries can help.

Many other frameworks have separate state management libraries. React has many, such as Redux and MobX, to name just two examples. Most of these libraries require you to use a particular function to set and update the state, and another function to subscribe for updates.

Svelte provides its own built-in lightweight global state management solution called stores. This provides complete reactivity in the simplest possible way. It cuts out the setting and subscribing logic by adding it during compilation.

Svelte 5 looks to unlock universal, fine-grained reactivity with runes. It addresses some of the reactivity gotchas that can come with more complex and demanding apps, leading to puzzling, undocumented behaviors.

Further reading:

• A guide to choosing the right React state management solution
• Exploring the magic of runes in Svelte 5
• Understanding Redux: A tutorial with examples
• MobX adoption guide

How does Svelte work?

Components are the building blocks of Svelte applications. They’re written in .svelte files.

Since Svelte is a superset of HTML, the contents of these files resembles a HTML file with HTML markup, CSS styles includes in a <style> block, and JavaScript included using a <script> block:

<script>
    // logic goes here
</script>

<!-- markup (zero or more items) goes here -->

<style>
    /* styles go here */
</style>

Often, this is referred to as a single file component (SFC).

Being a compiler, Svelte can extend HTML, CSS, and JavaScript without any runtime overhead. To implement templating, Svelte extends these languages in the following ways:

• It extends HTML by allowing templating expressions in markup. It provides logic blocks in a fashion similar to other templating languages; in particular, it resembles Handlebars. Expressions are contained within curly braces:

{#if answer === 42}

What was the question?

{/if}

• It extends CSS by adding a scoping mechanism to allow each component to define its own styles without the risk of clashing with the style of other components. This works by adding a class to affected elements, which is based on a hash of the component styles; e.g., svelte-123az
• It extends JavaScript with reactivity. Any top-level statement can be made reactive by prefixing it with the $:, using JavaScript's label syntax. Svelte 5 has taken this further by adding runes — including symbols such as $state, $derived, and $effect — to provide universal, fine-grained reactivity

Extensions to the JavaScript language are minimal and are carefully picked to avoid breaking JavaScript syntax or alienating developers. In fact, you will be mostly working with vanilla JavaScript when using Svelte. The compiler only intervenes in specific situations for .svelte files.

To understand what the compiler outputs, you can look at the examples on the Svelte website. It has a code playground (called a REPL) that shows examples. Different tabs in this playground show the Svelte source code, the rendered result, the JavaScript output, and CSS output. Below is the "hello world" example: Svelte source code:

<script>
    let name = 'world';
</script>

<h1>Hello {name}!</h1>

JavaScript output:

/* App.svelte generated by Svelte v4.2.18 */
import {
    SvelteComponent,
    detach,
    element,
    init,
    insert,
    noop,
    safe_not_equal
} from "svelte/internal";

import "svelte/internal/disclose-version";

function create_fragment(ctx) {
    let h1;

    return {
        c() {
            h1 = element("h1");
            h1.textContent = `Hello ${name}!`;
        },
        m(target, anchor) {
            insert(target, h1, anchor);
        },
        p: noop,
        i: noop
Reactive statements,
        o: noop,
        d(detaching) {
            if (detaching) {
                detach(h1);
            }
        }
    };
}

let name = 'world';

class App extends SvelteComponent {
    constructor(options) {
        super();
        init(this, options, null, create_fragment, safe_not_equal, {});
    }
}

export default App;

Release history of Svelte

Looking at Svelte’s version history can help us understand why and how it works today:

1. Version 1 (26 November 2016) — The first version of Svelte was all about testing a hypothesis: that a purpose-built compiler could generate reliable code and deliver a great user experience
2. Version 2 (18 April 2018) — The second version was a small upgrade. The most visible change was improvements to the template syntax and some new lifecycle hooks
3. Version 3 (22 April 2019) — Version 3 was a significant overhaul. The focus was on delivering an outstanding developer experience. The aim was to enable writing components with significantly less boilerplate than other frameworks
4. Version 4 (22 June 2023) — Svelte 4 is mainly a maintenance release, bumping minimum version requirements and tightening up the design in specific areas. It sets the stage for the next generation of Svelte to be released
5. Version 5 (TBA) — Svelte 5 is now in the Release Candidate phase. This means that the design of the framework is largely settled, with no anticipated breaking changes between now and the stable release. This release involves a rewrite of the Svelte compiler and runtime

You can learn more about the new features coming up in Svelte 5 from the preview documentation, as well as by watching Rich Harris's presentation from the most recent Svelte Summit. The highlights include:

• Runes, the new signal-powered fine-grained reactivity API
• Overhauled event handling with less boilerplate and more flexibility
• Better component composition through snippets
• Native TypeScript support, including inside your markup

Why should you choose Svelte?

We’ve talked about some compelling reasons to use Svelte already. But let’s get into some more detail about important factors to consider: the learning curve, performance, bundle size, DX, documentation, integrations, and community & ecosystem.

Learning curve

Svelte prides itself on being incredibly easy to learn. It sticks closely to the classic web development model of HTML, CSS, and JavaScript.

Arguably, Svelte has fewer concepts and tools to learn than many other framework options. You can get started writing Svelte apps in a matter of minutes.

Performance

Svelte applications are fast, generally outperforming both React and Vue. The key is that Svelte optimizes everything at build time. It produces highly optimized vanilla JavaScript that has a minimal runtime overhead.

Not only that, but Svelte is getting faster. Svelte 4 creates smaller and faster hydration code than previous versions. The expectation is that Svelte 5, which will be a rewrite of the Svelte compiler and runtime, should yield further improvements.

Bundle size

Svelte produces small bundles. The prototypical ToDoMVC application creates a bundle of HTML, CSS, and JavaScript of the following sizes in the different frameworks:

• The Svelte implementation weighs 10.49 kB zipped
• The Vue implementation weighs 37.78 kB zipped
• The React implementation weighs about 54.60 kB zipped

Subsequent releases of Svelte have improved the bundle size. For example, on the kit.svelte.dev website, the JavaScript generated across the whole site was reduced in size by 12.7 percent (from 126.3 kB to 110.2 kB) when it was upgraded from version 3 to version 4.

Developer experience

Svelte is a superset of HTML and has less abstractions than other frameworks. As discussed above, Rich Harris made DX a key concern of the framework. He put a strong emphasis on the readability of the syntax and favoring patterns that allow developers to naturally write less code.

This extends to many details, including removing redundant constraints (such as not requiring a single top-level element), providing convenient conventions (such as making variables reactive through labeled statements), and providing shorthand.

This care and attention to syntax results in shorter, more succinct components. It enable you to express ideas more concisely. The difference is that a Svelte component is typically around 40 percent smaller than its React equivalent.

Svelte also has many out-of-the-box features that other frameworks don't, such as state management, animations, and a plugin system. You don't need to go searching for third-party solutions as often as you might when using other frameworks.

Lastly, Svelte has built-in code quality checking. It gives feedback on accessibility and unused CSS. For example, whenever you forget to put the alt attribute on an <img> tag, Svelte will display a warning like so:

A11y: <img> element should have an alt attribute

Documentation

The official Svelte site is well written and maintained. It has an excellent interactive tutorial, a collection of examples, and clear docs. You can try Svelte online using the REPL without needing to configure anything.

Mozilla Developer Network (MDN) has a Svelte Guide. As an established and popular framework, you can find a plethora of tutorials and courses on Svelte.

Integrations

Svelte provides a lot of features out of the box that relieve you of the burden of looking for third-party solutions. As Svelte is a mature framework, it has an excellent choice of integrations.

Svelte removes some constraints that you can encounter with other frameworks that build components on top of JavaScript. You can write more idiomatic JavaScript in Svelte, which can make it easier to integrate with other libraries, and there is less need for wrapper libraries as well.

The official application framework for Svelte is SvelteKit, though other application frameworks such as Astro support Svelte as well. SvelteKit allows you to build a multi-page application using Svelte components. It provides all the pieces you need to build a modern web app such as:

• A development server
• File-based routing
• Server-side rendering (SSR)
• Page-specific rendering modes
• Offline support

…and more.

There are plugins for all the major web bundlers to handle Svelte compilation, such as Vite (vite-plugin-svelte) and webpack (svelte-loader). They will output .js and .css files that you can insert into your HTML. There are also plugins for major testing frameworks to enable testing a Svelte codebase, such as Vitest and Playwright.

Furthermore, there is a good selection of component libraries compatible with Svelte, such as Flowbite, Skeleton, and Bits UI.

You can also find Svelte integrations for major code editors such as:

• Svelte for VS Code — Provides syntax highlighting and rich IntelliSense for Svelte components in VS Code, using the Svelte Language Server. The Svelte team maintains this
• vim-svelte — Vim syntax highlighting and indentation for Svelte 3 components
• web-mode.el — Emacs major mode including support for Svelte.
• IntelliJ (WebStorm) — Svelte Plugin for IntelliJ (WebStorm)
• Svelte for Sublime Text — Sublime Text syntax highlighting for Svelte 3 components

Svelte can also be used for mobile development via Svelte Native.

You can explore Svelte Society's list of packages to find other integrations.

Further reading:

• Testing a Svelte app with Vitest
• Getting started with Playwright component testing

Community & ecosystem

Svelte is an open source project that has a core team and many volunteer contributors. A volunteer organization called Svelte Society promotes Svelte and its ecosystem. They run a quarterly Svelte Summit. It is a well-loved and maintained project.

Though it’s open source, there are many established companies using Svelte, and it has sufficient financial backing. Rich Harris joined Vercel to work full-time on the project in 2021. Svelte also has an open collective organization and receives funding from the open source community.

Getting started with Svelte

As mentioned earlier, Svelte provides an interactive playground called the REPL (short for Read–Eval–Print Loop) that enables you to write and save Svelte applications in the browser. It's the easiest way to get started with Svelte.

You can use the REPL any machine without having to install anything. If you want to share an idea, ask for help, or report an issue, it's always extremely useful to create a REPL instance demonstrating the issue.

If you'd like a more fully-featured environment in the browser, you can try Svelte on StackBlitz.

The Svelte team recommends using SvelteKit for new projects:

npm create svelte@latest myapp
cd myapp
npm install
npm run dev

SvelteKit manages the Svelte compiler and provides all the other pieces you need to build a complete multi-page web application such as a development server, routing, deployment, and SSR support.

If you want a minimal setup, you can use Svelte with Vite. You can scaffold a project by running npm create vite@latest and selecting the svelte as the framework. It will create a skeleton project for you: With this, npm run build will generate HTML, JS, and CSS files inside the dist directory. This will enable you to to build a single-page app. If you want to build a multi-page app, you will need to choose a routing library as well.

Key Svelte features to know

Let's take a quick walk through some of the key features of Svelte. I recommend the interactive tutorial on svelte.dev to learn more.

Components

In Svelte, an application is composed of one or more components. A component is the atomic unit that contains everything that is needed to render a piece of the UI. It’s written in a .svelte file that resembles a HTML file and contains HTML, CSS, and JavaScript:

<script>
    // logic goes here
</script>

<!-- markup goes here -->

<style>
    /* styles go here */
</style>

All three sections — script, styles, and markup — are optional.

To demonstrate the basic premise, let's create a component that issues a simple greeting where you provide the name:

<!-- Greeting.svelte -->
<script>
    let name = 'Joe';
</script>

<h1>Hey <span>{name}</span>!</h1>

<style>
    span {
        color: hsl(12,94%,62%);
    }
</style>

Here’s the result:

Here is the demo.

The name of the component is taken from the file name. The convention is to capitalize the names of the components to distinguish them from HTML elements, which is why we named the above component Greeting.svelte.

It would be impractical to put your entire app in a single component! You can nest components by importing components from other files and including them in your markup:

<!-- App.svelte --->
<script>
    import Greeting from './Greeting.svelte';
</script>
<p>Below is our nested component 👇</p>
<Greeting />

Reactivity

Svelte uses let, =, the export keyword, and the $: label to identify reactive states. Dependents of a variable are determined when Svelte compiles your component.

Reactive variables

Let's do the obligatory counter example that increments a number when a button is clicked:

<script>
  let count = 0;

  const increment = () => {
    count += 1;
  };
</script>

<button class="button" on:click={increment}>
  Count is {count}
</button>

You work with a variable as you do in vanilla JavaScript. You declare a variable with let, and add 1 to its value! Svelte will take care of the updates to the DOM for you.

Here is the demo.

Reactive statements

Often, some parts of a component's state need to be computed from other parts, such as a fullname derived from a firstname and a lastname. For these situations, Svelte has reactive declarations.

For example, we could do the following to show the square of the count variable:

<script>
    let count = 0;
    $: squared = count * count;
</script>    

Now any time count changes, squared is recomputed. If a reactive statement consists entirely of an assignment to an undeclared variable, Svelte will inject a let declaration on your behalf. We can use squared in our markup the same as count:

<div>Squared: {squared}</div>

Here's the result: Here is the demo.

Styling

Styles are added to a <style> block. All styles are scoped to a component by default. Svelte adds a class with a hashed value to each style rule in the output CSS.

The style block from our greeting example:

<style>
    span{
        color: hsl(12, 94%, 62%);
    }
</style>

Becomes this:

span.svelte-1mdkc4p
{
    color:hsl(12,94%,62%);
}

Svelte also allows you to provide global styles from within a Svelte component by using :global should you need it:

<style>
    :global(.noscroll) {
          overflow: hidden;
    }
</style>

However, typically, you would have a separate global stylesheet.

Data passing with props

In an application, you'll need to pass data from one component down to its children. To do that, you need to declare properties (props). In Svelte, this is done with the export keyword.

For example, in a to-do app, you have a list of items you need to do. We can create a TodoList component that receives an array of to-dos. We declare the array with export and name it todos:

<!-- TodoList.svelte -->
<script>
  export let todos = [];
</script>

{#if todos.length > 0}
  <ul>
    {#each todos as todo}
      <li >{todo.name}</li>
    {/each}
  </ul>
{:else}
  <p>Congratulations, all done!</p>
{/if}

Now, we can supply our to-do items to the TodoList component with the todos prop (attribute):

<!-- App.svelte -->
<script>
  import TodoList from "./components/TodoList.svelte";

  let todos = [
    { id: 1, name: "Create a Svelte starter app", completed: true },
    { id: 2, name: "Create your first component", completed: true },
    { id: 3, name: "Complete the rest of the tutorial", completed: false }
  ];
</script>

<TodoList todos={todos} />

Now, the app shows the list of our to-dos! You may want to augment it to edit the items: Here is the demo.

Form bindings

Svelte enables two-way binding between data and the UI through the bind directive. This is especially useful with forms.

The simplest bindings reflect the value of a property such as input.value. For example, if we want to change our greeting component to take a name from an user:

<!-- Greeting.svelte -->
<script>
    let name = 'world';
</script>

<input type="text" bind:value={name}>

<h1>Hello {name}!</h1>

Now, any time we change the text in the input, it will update the <h1>: Here is the demo.

If the variable name matches the property name, you can use a shorthand:

<script>
    let value = 'world';
</script>

<input type="text" bind:value>

Events

To listen to DOM events, you use the on: directive in the form of: on:eventname={handler}.

When we want to respond to a button's click we use on:click as an attribute, and can provide a handler inline as below:

<button on:click={() => alert('clicked')}>
    Click me
</button>

This will pop up an alert box saying clicked every time the button is clicked. Usually, you will have a separate event handler function in the <script> block like we showed in our Counter example.

DOM event handlers can have modifiers that alter their behavior. For example, a handler with a once modifier will only run a one time:

<button on:click|once={() => alert('clicked')}>
    Click me
</button>

Some other modifiers include:

• preventDefault — calls event.preventDefault() before running the handler
• stopPropagation — calls event.stopPropagation(), preventing the event reaching the next element

Modifiers can be chained together; e.g., on:click|once|preventDefault={...}.

State management

For state management, Svelte provides its own built-in lightweight solution called stores. It cuts out the setting and subscribing logic by adding it during compilation.

You only need to create a readable, writable, or derived store. Then, you can use the reactive $store syntax in components. It feels like using any other JavaScript variable:

<script>
    import { writable } from 'svelte/store';

    const count = writable(0);
    console.log($count); // logs 0

    $count += 1;
    console.log($count); // logs 1
</script>

It’s as simple as that.

Further reading:

• Application state management with Svelte

Use cases for Svelte

Svelte can be used to build any type of modern web application. SvelteKit can produce a static site, single-page app, or a multi-page app that can be deployed to many web platforms. With Svelte Native, you can even build mobile applications.

Nevertheless, Svelte is particularly appropriate to tackle the following situations:

• Prototyping — Svelte’s simplicity make it an excellent choice for quickly prototyping ideas and concepts
• Web applications intended for low-power devices — Svelte produces apps with smaller bundle sizes. This is ideal for devices with slow network connections and limited processing power
• Data-intensive and visualization applications — In recent years, there has been a migration to Svelte for data visualization (data viz). Data viz concerns were initial considerations when creating the framework because the creator of the framework was a graphics editor! Svelte's reactive data binding, compile-time code optimization, and built-in support for transitions and animations make it a compelling choice for building data-intensive applications and visualizations
• Improving onboarding — Web developers with basic HTML, CSS, and JavaScript knowledge can easily grasp Svelte specifics in a short time and start building web applications. This can be useful to build up a team quickly

Further reading:

• Essential transitions and animations in Svelte
• Data visualization with Svelte and D3

Deploying your Svelte project

The output of a Svelte application is nothing more than a bunch of HTML, CSS, and JavaScript files. All you need is a web server capable of serving static files, and you can upload the output folder to deploy your app. This means you have plenty of deployment options to choose from.

You’re most likely to use Svelte through an application framework such as SvelteKit that will build and package the project for your target environment. SvelteKit provides adapters, so you can adapt it for your deployment target. You can read SvelteKit's build and deploy documentation for more information.

While you can deploy your project manually, you probably will want to avoid that task!

To automate the process, it’s typical to have a CI/CD pipeline to deploy your app whenever a commit is pushed to a particular branch of a git repository. Platforms such as Vercel let you link a project to a repository on GitHub and other Git hosts. They’ll take care of triggering a deployment whenever changes are detected.

Most major hosting platforms have dedicated deployment guides for Svelte and SvelteKit:

• SvelteKit on Netlify
• SvelteKit on Vercel
• Svelte on CloudFlare Pages

Framework comparison: Svelte vs. React vs. Vue

Choosing between frameworks depends on many factors: project requirements, existing infrastructure, team expertise, and personal preferences, to name a few. This makes it difficult to give definitive advice on which framework to choose.

However, it’s useful to understand the strengths and weaknesses of each. Let's look at how React and Vue compare to Svelte. These frameworks share the goal of making it easier to build modular, interactive user interfaces:

More detailed performance analysis

You can compare performance in a more rigorous way by consulting Stefan Krause's js-framework-benchmark project. Here are results based on the latest snapshot:

Comparison summary

React is a popular and robust choice for large-scale applications, but it has shortcomings with regard to performance and developer experience. Vue is user-friendly and versatile — a solid choice all around. Svelte excels in simplicity and performance, it really shines for apps that are smaller and are data-intensive.

Consider the trade-offs and strengths of each framework before making your decision.

Further reading:

• React vs. Svelte: Performance, DX, and more
• Svelte vs. Vue: Comparing framework internals

Conclusion

Svelte is a great frontend framework. With its emphasis on developer experience and simplicity, Svelte has won over many developers. It regularly outperforms its competitors, as a compiler-centric framework it produces highly optimized code with small bundle sizes.

Svelte has many out-of-the-box features that other frameworks don't, and can't offer as runtime-centric frameworks. It’s a mature and established framework with all the key integrations that you need to build modern web apps.

While Svelte is behind React and Vue in terms of popularity and community, it is continually growing. Svelte is definitely worth exploring for your next frontend project.

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