For those just started with Deno, and those who work in the frontend, you might be having the thought, "Can I build something as complex as a NextJS or Create-React-App (CRA) application using Deno?" If you need help with anything JS, feel free to reach out through (a video-chat platform) or Superpeer Twitter. I was thinking the same as I wanted to try Deno because of its better shareability  resulting from the ability of running an application directly from a URL (The Deno compiler supports running JS/TS files from a URL and it also supports imports from a URL, resulting in extreme portability.) I looked if any existing solutions, articles were there online, but only found , which built an SSR'ed React application using some complex techniques, nothing simple like getting started with NextJS or CRA. this article So, through my searches online, I ended up at , which has one of the coolest landing page animations ever. AlephJS Aleph is a Zero-Config, Typescript driven React framework, just like NextJS, the only drawback being that Aleph is still very much in Alpha. So to get a true Next-like React experience inside of Deno, let's get started with AlephJS. It has much of the same conventions, such as: A directory for creating URL routes /pages Direct support in pages .js, .jsx, .ts, .tsx A directory for serving static assets like video, audio, or image files /public A folder for serving Javascript or Typescript files as serverless APIS. /pages/api Getting Started To be able to use AlephJS, you need Deno installed as a pre-requisite. You can see how to install and get started with Deno in my . previous article here For getting started with Aleph, you need to first install the Aleph CLI by running deno install -A -f -n aleph https://deno.land/x/aleph@v0.3.0-alpha.1/cli.ts After installation, you can run aleph -h to check whether it got installed correctly. Because of the portability of Deno, you can replace aleph with deno run -A [<https://deno.land/x/aleph@v0.3.0-alpha.1/cli.ts>](<https://deno.land/x/aleph@v0.3.0-alpha.1/cli.ts>) start $app_URI for any command and it will be able to run the Aleph program without having the CLI locally installed. To create a starter app, run: aleph init hello hello cd And start the app in development mode using aleph dev to start a server at port 8080. To start the app in production mode, you have to first build the app and then run the built app. This is done through the commands: aleph build aleph start # build your app # runs built app After you initialise your Aleph app, you will find the root component being defined at pages/index.tsx. It's a normal React component. Experiment with it to see how Aleph works. You can add more routes to your application by creating more .jsx or .tsx files inside the pages folder. Read more on routing . here Importing Libraries I've written about Deno previously on , where I demoed Deno basics, including URL imports. Since Aleph is a Deno framework, all imports happen in the "Deno way". freeCodeCamp There are 2 kinds of libraries which you can import in a Deno application. Importing Deno-Native Libraries: These libraries were either built for Deno, or ported over from npm to support Deno usage. Importing from NPM: Any dev who has worked with JS recently knows about npm. If you don't, npm (which used to stand for node package manager) is the standard repository for all Javascript libraries. Luckily, Deno has limited support for npm libraries. Using tools like or skypack.dev, users can import npm libraries into Deno. esm.sh 1. Importing Deno-Native Libraries The way to import Deno-Native libraries in your application is by importing their URL directly. You can find a list of Deno libraries here: deno.land/x To test this out, let’s import this , and calling a date format function in a React page. Create a file date-import.tsx in the pages folder of your app. Inside the file, write the following code: standard Deno date formatting library React ; { format } ; { ;
} // react is a compulsoy import in Aleph import from "react" // import the format function from its URL import from "https://deno.land/std@0.88.0/datetime/mod.ts" // capitalize the function name so it's recognized as a React component export default ( ) function DateImport // Here, directly calling the format function works as expected. return Hello all! Today is: {format(new Date(), "dd-MM-yyyy")} < > section </ > section To see the output of this file, go to , or its equivalent for your server. You should see the page displaying the day's date. localhost:8080/date-import 2. Importing from NPM To import an npm library, you can also import directly from a URL, but in this case there's a slight change. Since we talked about and skypack.dev, let's try to use them in action. In this case, let's try to use the library in our project. esm.sh dayjs Note: Not all npm libraries work correctly in Deno because they may be relying on Node-specific functions. To import a library in , you post-pend the library's package name to the URL. In this case to import dayjs, we would be importing . This also works for any CSS files you might want to import from a library. esm.sh https://esm.sh/dayjs Now, let's create a file in pages called dayjs-import.tsx. So, the code in our page will look like: React ; dayjs ; { ;
} // react is a compulsoy import in Aleph import from "react" // import the dayjs npm library using esm.sh import from "https://esm.sh/dayjs" // capitalize the function name so it's recognized as a React component export default ( ) function DateImport // call the dayjs function directly to display today's date return Hello all! Today is: {dayjs().format("DD-MM-YYYY")} < > section </ > section To see the output of this file, go to , or its equivalent for your server. You should see the page displaying the day's date. localhost:8080/dayjs-import There's one important thing before we go ahead though, how do you handle like importing useState, useEffect, etc? Luckily, the devs of aleph have already written an example for us. Go into ./lib/useCounter.ts and you'll find the code for the custom hook being used for the counter in the home page. React imports Since I want to focus the article on Aleph and React itself, to check out all the different ways you can import a CSS file in Aleph, check out . this page from the official documentation Building a Sample App Now, let's get into the nitty gritty and try to build a React app in Aleph ourselves. We're going to be building "Is It Down?", a sample app I had made using an existing website checking API. This app will allow us to check whether a website is currently up or down. Codesandbox link: https://codesandbox.io/s/awesome-firefly-5dofg Building this application will show how to use the State hook, the Effect hook and making API calls inside of Aleph. Create a new file called web-checker.tsx in your pages folder. Let's start by just adding the UI elements first. We'll display an h1 element with the title, an h2 element linking to the API and a form element to take user input. This is a non-interactive page just displaying the elements. React ; { ( <h1>Is it Down?</h1> <h2>
        Go{" "}
        <a
          href="https://rapidapi.com/jakash1997/api/website-data-gathering-and-update-tracking"
          target="_blank"
        >
          here
        </a>{" "}
        to get an API key
      </h2> <form
        onSubmit={(e) => {
          e.preventDefault();
        }}
      >
        <input
          type="text"
        />
        <button type="submit">Submit</button>
      </form>
    </div> import from "react" export default ( ) function App return < = " ", " " }}> div style {{ fontFamily: sans-serif textAlign: center );
} Next, to capture the state of the input field, and to also capture the response of the API call we will have to make, let's introduce state. React, { useState } ; { [siteURL, setUrl] = useState( ); [response, setResponse] = useState( );
... // import useState from react import from "react" export default ( ) function App // define both state variables const "" const undefined Now, we'll use this state inside our input element, so it can react to it. ...
<input
  value={siteURL}
  onChange={(e) => setUrl(e.target.value)}
  type= />
... "text" We'll also add some code to display a response, when it's returned from the API response ...
	< > < /form>
	
	<br / {JSON.stringify(response, null, 2)} < > code </ > code /div>
... Now, to get started with integrating the API, let's try to form the request correctly. In this case, the API is a simple GET call, so we only need to pass a param and an API key. Firstly, go here, and generate an API key: . Find the API key like shown in the screenshot and keep it somewhere safe. https://rapidapi.com/jakash1997/api/website-data-gathering-and-update-tracking Next, let's create a seperate function submitData which will generate the required request data. We will be using the axios library to make our GET call, so we will be forming its options object. ...
const [response, setResponse] = useState( ); submitData = {
  setResponse( ); options = { params: { siteURL }, headers: { : , : ,
    },
  }; .log( , options);
}; (
... undefined const ( ) => siteURL "Loading..." const // passing siteURL here through object shorthand // passing the required headers here "x-rapidapi-key" "YOUR_API_KEY" "x-rapidapi-host" "website-data-gathering-and-update-tracking.p.rapidapi.com" // print options here console "options" return And we add this to the onSubmit function in our form. onSubmit={(e) => {
  e.preventDefault();
  submitData(siteURL);
}} Now, whenever you press the Submit button, you will see the options we generated in the console. If you see the options object in the console, you're doing good so far! Next we just have a simple step of importing the axios library using http://esm.sh and using it to make an API call. Import axios after the react import like: React, { useState } ; axios ;

... import from "react" import from "https://esm.sh/axios" And use it in the submitData function as: ...
	axios
    .get( ,
      options
    )
    .then( {
      setResponse(response.data); .log(response.data);
    })
    .catch( { .error(error);
    });
};
... "https://website-data-gathering-and-update-tracking.p.rapidapi.com/sitecheck" ( ) function response console ( ) function error console And that's it! Try submitting the form again and this time, you'll see the result both on screen, and also in the console. So that has been Aleph, a really interesting tool which allows you to bring your existing React knowledge, and mix it with the forward-looking nature and security of . deno.land If you liked this tutorial, you can follow me on Twitter . Feel free to reach out through (a video-chat platform) . @thewritingdev Superpeer Important Links https://dev.to/adriantwarog/react-deno-server-side-rendering-with-deno-ssr-4438 https://alephjs.org/ https://www.freecodecamp.org/news/build-a-url-shortener-in-deno/ https://alephjs.org/docs/basic-features/routing https://alephjs.org/docs/basic-features/built-in-css-support http://deno.land/x https://esm.sh https://codesandbox.io/s/awesome-firefly-5dofg https://rapidapi.com/jakash1997/api/website-data-gathering-and-update-tracking

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