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Utilizing Browser Storage to Enhance User Experience in a Qwik Application


As front-end developers, we are always looking for ways to enhance the user experience of our applications. One of the ways we can achieve this is by utilizing the browser storage to store data, and implement some form of caching.

Our web browser has provided us with different storage options to store data such as cookies, localStorage, and indexDB. In this article, we will be looking at how we can use storage to enhance a Qwik application. We are going to also explore hook technology in implementing this.

Hooks 🪝

We will be extracting our storage function into a hook function that we can use in any part of our application. What are Hooks? Hooks are JavaScript functions that manage a component’s state and side effects by isolating them. That means we can isolate all the stateful logic into a hook and use it in any component. And just like in ReactJS, Qwik also allows us to create our own custom hooks.

Project Set Up

To get started, we need to create a new Qwik app. We can do this by running the following command in our terminal:

npm create qwik@latest

You can also get additional tools and configurations using our kit by running the command in your terminal:

npm create @this-dot/starter --kit qwik-graphql-tailwind

After the project is created, we can run the following command to start the development server:

npm run dev

Now we can open our browser and navigate to http://localhost:5143 to see our app running.

successful running app

The demo app we will be building is a simple form with an input field and a button. The input field will be used to enter a value, and the button will be used to reset the form and the storage state.

We will also see how we apply this functionality in our Qwik GitHub showcase app to persist/catch data we fetch from the GitHub API.

Storage Hook

After the project is created, we can create a new folder in the src folder and name it “hooks”. In the hooks folder, we will create a new file and name it useLocalStorage.ts. In this file, we will create our useLocalStorage hook.

  import { $, QRL, useClientEffect$, useStore } from "";

  export function useLocalStorage(key: string, initialState: any): [any, QRL<(value: any) => void>]  {
    const store = useStore({ value: initialState });

    useClientEffect$(() => {
      try {
        // Get from local storage by key
        const item = window.localStorage.getItem(key);
        // Parse stored json or if none return initialState
        store.value = item ? JSON.parse(item) : initialState;
      } catch (error) {
        // If error also return initialState
        store.value = initialState;

    const setValue$ = $((value: any) => {
      try {
        // Save state
        store.value = value;
        // Save to local storage
        if (typeof window !== "undefined") {
          window.localStorage.setItem(key, JSON.stringify(value));
      } catch (error) {
        // A more advanced implementation would handle the error case

    return [store, setValue$];

Let me explain what is happening here:

  • The useStore hook is used to store the value. We initially set this value to the initial state value passed to our custom hook.
  • In the useClientEffect$ hook, which runs on the client, we try to update our store value with the value from the localStorage based on the key passed to the hook. If the value is found, we set its parsed value to the store value. If not, we set the store value to the initial state passed to the hook. We also catch any error that might occur, and set the store value to the initial state.
  • We also have a setValue$ function that is used to set the value of the store and also save it to the localStorage. The setValue$ function is wrapped in a $ function, which is used to create a QRL function- a Qwik optimizer marker function. For more information on QRL, visit the docs.
  • We also return store and the setValue$ function. This exposes them to be consumed in our components. We don't want to return the value of the store or else it will lose its reactivity.

Form Component

In the components folder, we will create a new folder called form, which will contain an index file that will export our Form component. The form will be expecting two props; value and setValue, which are from the useLocalStorage hook.

import { component$, QRL } from "";

interface IProps {
  value: string,
  setValue: QRL<(value: any) => void>

export default component$((props: IProps) => {

  return (
        onInput$={(e: KeyboardEvent) => {
          const input = as HTMLInputElement;
      <input type="submit" value="Reset" />

In our index file, we will import the useLocalStorage hook and the Form component, and our updated index file will look like this:

  import { component$ } from '';
  import Form from '~/components/form';
  import { useLocalStorage } from '~/hooks/useLocalStorage';

  export default component$(() => {
    const [value, setValue] = useLocalStorage("name", "Guest");

    return (
          Welcome to Qwik {value} <span class="lightning">⚡️</span>
        <Form value={value} setValue={setValue} />
        <br />
        <input type="button" value="Reload Page" onClick$={() => window.location.reload() } />

We can now see what our simple app looks like in the browser, and we can interact with it. By entering a value in the input field and reloading the page, we can see that the value persists.


Next, we want to implement this hook in our Qwik GitHub showcase app to persist the gists data we fetch from the GitHub API and persisting it in the localStorage. We transform our fetch gists logic from this:

  useClientEffect$(async () => {
    const abortController = new AbortController();
    const response = await fetchGIst(abortController);
    updateGists(store, response);
  useClientEffect$(async () => {
    if (cachedGists.value) {
      store.isLoading = false; = cachedGists.value;
    } else {
      const abortController = new AbortController();
      const response = await fetchGIst(abortController);
      updateGists(store, response, setGists);

So we check if we have cached gists in the Storage. If we do, we set the store data to the cached gists. If not, we fetch the gists from the GitHub API and update the store data with the response. We also pass the setGists function to the updateGists function, which is the setValue$ function from the useLocalStorage hook. This function is used to set the value of the store, and also save it to the localStorage.


In this article, we were able to understand why we need to improve user experience with a focus on persisting data. We also saw how to create a hook in a Qwik framework, and use our hook to persist data in the localStorage.

A link to the project repo can be found here and for our Qwik showcase app, here.

If you have any questions or run into any trouble, feel free to reach out on Twitter or on our Discord.

This Dot Labs is a development consultancy that is trusted by top industry companies, including Stripe, Xero, Wikimedia, Docusign, and Twilio. This Dot takes a hands-on approach by providing tailored development strategies to help you approach your most pressing challenges with clarity and confidence. Whether it's bridging the gap between business and technology or modernizing legacy systems, you’ll find a breadth of experience and knowledge you need. Check out how This Dot Labs can empower your tech journey.

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Unit Testing Qwik Components

Unit Testing Qwik Components Qwik is a new, superfast JavaScript framework from Created by Miško Hevery, the author of AngularJS, Qwik aims to deliver instant loading web applications of any size or complexity through resumability. This is accomplished partially by delaying the execution and download of JavaScript for as long as possible while providing an excellent developer experience. > "You know React? You know Qwik." > — Given Miško's background as the creator of AngularJS, it's interesting that writing Qwik feels very similar to writing React. It even has a React compatibility mode. Personally, I have experience using mostly Angular, but I found that developing with Qwik was very smooth and enjoyable. So, although I am definitely hesitant to jump on new technologies, after attending Miško's workshop, browsing through all the resources at tinkering with Qwik, and building a couple of apps with it, I became a fan. 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The tool allows you to preview and integrate these assets effortlessly within the DevTools environment. These features significantly enhance the ease and efficiency of managing your app's dynamic and static elements. The Runtime Config and Payload Editor The Runtime Config and Payload Editor in Nuxt DevTools make working with your app's settings and data straightforward. The Runtime Config lets you play with different configuration settings in real time, like adjusting settings on the fly and seeing the effects immediately. This is great for fine-tuning your app without guesswork. The Payload Editor is all about managing the data your app handles, especially data passed from server to client. It's like having a direct view and control over the data your app uses and displays. This tool is handy for seeing how changes in data impact your app, making it easier to understand and debug data-related issues. Open Graph Preview The Open Graph Preview in Nuxt DevTools is a feature I find incredibly handy and a real time-saver. It lets you see how your app will appear when shared on social media platforms. This tool is crucial for SEO and social media presence, as it previews the Open Graph tags (like images and descriptions) used when your app is shared. No more deploying first to check if everything looks right – you can now tweak and get instant feedback within the DevTools. This feature not only streamlines the process of optimizing for social media but also ensures your app makes the best possible first impression online. Timeline The Timeline feature in Nuxt DevTools is another standout tool. It lets you track when and how each part of your app (like composables) is called. This is different from typical performance tools because it focuses on the high-level aspects of your app, like navigation events and composable calls, giving you a more practical view of your app's operation. It's particularly useful for understanding the sequence and impact of events and actions in your app, making it easier to spot issues and optimize performance. This timeline view brings a new level of clarity to monitoring your app's behavior in real-time. Production Build Analyzer The Production Build Analyzer feature in Nuxt DevTools v1.0 is like a health check for your app. It looks at your app's final build and shows you how to make it better and faster. Think of it as a doctor for your app, pointing out areas that need improvement and helping you optimize performance. API Playground The API Playground in Nuxt DevTools v1.0 is like a sandbox where you can play and experiment with your app's APIs. It's a space where you can easily test and try out different things without affecting your main app. This makes it a great tool for trying out new ideas or checking how changes might work. Some other cool features Another amazing aspect of Nuxt DevTools is the embedded full-featured VS Code. It's like having your favorite code editor inside the DevTools, with all its powerful features and extensions. It's incredibly convenient for making quick edits or tweaks to your code. Then there's the Component Inspector. Think of it as your code's detective tool. It lets you easily pinpoint and understand which parts of your code are behind specific elements on your page. This makes identifying and editing components a breeze. And remember customization! Nuxt DevTools lets you tweak its UI to suit your style. This means you can set up the tools just how you like them, making your development environment more comfortable and tailored to your preferences. Conclusion In summary, Nuxt DevTools v1.0 marks a revolutionary step in web development, offering a comprehensive suite of features that elevate the entire development process. Features like live updates, easy navigation, and a user-friendly interface enrich the development experience. Each tool within Nuxt DevTools v1.0 is thoughtfully designed to simplify and enhance how developers build and manage their applications. In essence, Nuxt DevTools v1.0 is more than just a toolkit; it's a transformative companion for developers seeking to build high-quality web applications more efficiently and effectively. It represents the future of web development tools, setting new standards in developer experience and productivity....