Introduction to SVELTE

A JavaScript framework to build fast, beautiful, and reactive user interfaces

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Svelte is a new hot thing these days in the ecosystem of JavaScript frontend frameworks. Svelte allows developers to create complex frontend applications by providing them with a new and unique way to write user interfaces. With Svelte, you write less code that is compiled out of the box into tiny vanilla JS (thanks to No Virtual DOM) and have the capability to bring reactivity in your code without including any complex state management libraries.

Now you must be thinking when there are great frontend frameworks already available such as React or Vue, why one more? How is Svelte different from any of them?

The answer to this question from their own documentation says that Svelte unlike React or Vue does all the heavy lifting in the compilation step when you are building your application instead of doing it in the browser. In the traditional frontend frameworks, we can write declarative state-driven code that is shipped to the browser, and then the browser converts it into DOM operations.

But since Svelte runs at build time, it converts your code (components) into highly efficient plain JavaScript code that surgically updates the DOM providing you with the ability to write highly performant and efficient applications.

Get Started with Svelte

As we have seen so far that Svelte is by design different from the other frameworks we have been using, and therefore we can’t include this in our projects using traditional ways such as by using script tag on the page or by using import or require statements. Instead, Svelte is a compiler that works behind the scenes to convert your code into optimized and beautiful JavaScript.

There are a couple of ways we can start a new Svelte project. But in this blog, we will be using the scaffolding tool called degitto do that_. A_lso, make sure that node and npm are installed on your computer. And, since we are going to use _npx _during this project, we need to have the version of npm which supports npx.

Lets now dive into creating a new Svelte project. We will start with the following command:

npx degit sveltejs/template my-test-project

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Introduction to SVELTE
Poppy Cooke

Poppy Cooke


Svelte Tutorial - Create a Svelte Project

In this Svelte tutorial we’ll be taking a look at creating a Svelte project using the Svelte template. We’ll go over the file structure, install a VS Code extension and look at starting the built-in development server.

For your reference, check this out:

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5 Reasons Why Svelte is Improving UI Development (Svelte.JS)

5 Reasons Why Svelte is Improving UI Development (Svelte.JS)

Svelte can be used anywhere and for anything you’d use Angular, React or Vue for. It’s a JavaScript tool used for building fast web applications, with a big focus on super slick and interactive user interfaces that are not only incredibly easy to build within the Svelte framework, but are also highly code efficient – never a bad thing.

There’s no performance cost associated with the framework’s abstractions, nor is there that initial dip in performance when an app first opens that’s usually attributed to the DOM diffing version update checking process.

Better yet, there is the flexibility to either build the entire app in Svelte, or to add in segments incrementally to an already existing base of code. Components made in Svelte can operate as stand-alone packages that don’t require the overhead of a conventional framework dependency, and can be used anywhere really.

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00:00 - Intro
02:49 - What is Svelte
04:22 - What is Svelte used for
06:01 - Svelte pros
09:08 - Svelte cons
11:00 - Who’s using Svelte


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Cayla  Erdman

Cayla Erdman


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Getting Started Building a Svelte App with SvelteKit

Svelte is a lightweight framework for building web applications. When you use it, it looks and feels a lot like other frontend frameworks like React and Vue, but leaves the virtual DOM behind. That, along with other optimisations means it does far less work in the browser, optimising user experience and load time.

In this guide, we'll be going over how to setup your first Svelte application using SvelteKit. Svelte has a number of different ways to make applications, and SvelteKit is one of the official packages from Svelte for doing that. If you're interested in other frameworks, you might enjoy a similar guide we have on making your first Vue application.

#Creating your first Svelte Application

To get started, open up a new terminal window and initiate your svelte application using the command below. Note if you don't have npm installed, you'll need to get it. You can install npm by installing Node.JS, via the link here.

Once you have Node.JS and NPM installed, run the command below. Before you do that though, make sure you use cd to move into the folder you want to create your new Svelte application in.

npm init svelte@next my-svelte-app

When you run this command, you'll auto generate a Svelte template in a folder called my-svelte-app. Svelte will guide you through a number of options. Select your preferences. The image below shows the one's I have selected. For the purposes of this guide, I will be using the Skeleton project.

Options for Selecting in SvelteKit

Finally, run the following command to cd into your svelte directory:

cd my-svelte-app

And then install all of your dependencies using the following line:

npm i

#Svelte File Structure

If you are familiar with other frameworks, then Svelte will feel familiar. Here is an overview of the file structure in Svelte, for the project we have just made:

static                 <-- where we store all of our public assets like favicons, images, and fonts
|- favicon.png         <-- our favicon
tests                  <-- a folder to store our tests
|- test.js             <-- an example test using @playwright
src                    <-- our main Svelte app files
|- routes              <-- a folder to store all of our routes in
|-- index.svelte       <-- our index route file. This will be the file displayed at the route of the site
|- app.d.ts            <-- our core Svelte app file
|- app.html            <-- our main index file where the app will appear
.gitignore             <-- files we wish to ignore for git
.npmrc                 <-- config file for npm
.prettierrc            <-- config file for prettier
.eslintrc.cjs          <-- config file for eslint
package.json           <-- our NPM installed packages
playwright.config.js   <-- config file for playwright
svelte.config.js       <-- config file for svelte itself
tsconfig.json          <-- config file for typescript

Our basic Svelte application is ready to go. If you want to see how it looks, you can serve it on your local computer on the URL http://localhost:3000 by running the following command in your Svelte application folder:

npm run dev

If you visit http://localhost:3000 in your browser, you should see something like this:

Our first Svelte Application

#Creating new pages or routes in Svelte

To make a new route in Sveltekit, simply make a new file within the routes folder. For example, if you make a file called about.svelte, then it will show up at http://localhost:3000/about. Another way you can do this is to make a new folder called about, and put index.svelte in that folder, http://localhost:3000/about will work.

#Try it yourself

Create a new page within your /src/routes folder, called about.svelte. Now when you go to http://localhost:3000/, you will be able to access that page. Similarly, you can try making a folder called about with a file placed inside called index.svelte

#How to run your SvelteKit App on Node.JS

To run your Svelte application on a server or locally on a Node.JS server, you need to use an adapter. If you want to run your Svelte application on a Node Server, install @sveltejs/adapter-node@next via the following line:

npm i @sveltejs/adapter-node@next 

Now we have to change our svelte.config.js file. We need to use the new adapter, and change our kit.adapter object within the config file. You can replace the contents of your svelte.config.js with the code below, but we're only changing two lines - our adapter import, and then adding the build directory in your config:

// We have changed the adapter line to use adapter-node@next
import adapter from '@sveltejs/adapter-node@next';
import preprocess from 'svelte-preprocess';

/** @type {import('@sveltejs/kit').Config} */
const config = {
	// Consult
	// for more information about preprocessors
	preprocess: preprocess(),

	kit: {
		// We have changed this to point to a build directory
		adapter: adapter({ out: 'build' })

export default config;

#Other SvelteKit adapters

If you want to run your Svelte application on Cloudflare, Netlify, or Vercel, then you need to use one of these adapters, you don't need to do anything. These are all included by default in adapter-auto - so only change your svelte.config.js file if you aren't planning on using a Node.JS server.

#How to build your SvelteKit App for Production

Now that we've configured our adapter, let's build our application. In SvelteKit, it's easy to make your app ready to run in a production environment. Simply run the following command, which will create a new folder called .svelte-kit with all your production ready files in.

npm run build

Now, if you want to preview your production build, simply run the following command:

npm run preview

If you are running your application on a Node.JS server and have updated your adapter, as shown in the previous section, then you can run your new Svelte application locally by running the following command in your Svelte directory:

node build/index.js

Now when you navigate to http://localhost:3000/, your Svelte application should show, only this time it will be ready for production.


In this guide we've looked at how to use SvelteKit to create your first Svelte application with routes. Let's look at what we've learned:

How to set up SvelteKit and create the basic structure of your Svelte application.

How to use routes in SvelteKit, so you can have multiple pages on your application.

How to update your config file to use the right adapter, based on where you want to deploy your application.

How to build and run your application locally on a Node.JS server.

Next, you can try playing around with Svelte to start customizing your application.


#svelte #sveltekit 

Kiera Smart

Kiera Smart


Introduction to Svelte - Svelte Beginners Guide in 2020

Svelte is a component-based JavaScript framework similar to Angular, React or Vue

How do you get started iwth Svelte? In this video I discuss a beginners guide to Svelte and how it works. This tutorial goes over all the basics and more!

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