Henry Short

Henry Short


Create Node.js Web App to Launch the Immersive Reader

The Immersive Reader is an inclusively designed tool that implements proven techniques to improve reading comprehension for emerging readers, language learners, and people with learning differences such as dyslexia. This tutorial covers how to create a Node.js web application that launches the Immersive Reader. In this tutorial, you learn how to:

  • Create a Node.js web app with Express
  • Acquire an access token
  • Launch the Immersive Reader with sample content
  • Specify the language of your content
  • Specify the language of the Immersive Reader interface
  • Launch the Immersive Reader with math content

If you don’t have an Azure subscription, create a free account before you begin.


  • An Immersive Reader resource configured for Azure Active Directory authentication. You will need some of the values created here when configuring the environment properties. Save the output of your session into a text file for future reference.
  • Node.js and Yarn
  • An IDE such as Visual Studio Code

Create a Node.js web app with Express

Create a Node.js web app with the express-generator tool.

npm install express-generator -g
express --view=pug myapp
cd myapp

Install yarn dependencies, and add dependencies request and dotenv, which will be used later in the tutorial.

yarn add request
yarn add dotenv

Acquire an Azure AD authentication token

Next, write a backend API to retrieve an Azure AD authentication token.

You need some values from the Azure AD auth configuration prerequisite step above for this part. Refer back to the text file you saved of that session.

TenantId     => Azure subscription TenantId
ClientId     => Azure AD ApplicationId
ClientSecret => Azure AD Application Service Principal password
Subdomain    => Immersive Reader resource subdomain (resource 'Name' if the resource was created in the Azure portal, or 'CustomSubDomain' option if the resource was created with Azure CLI Powershell. Check the Azure portal for the subdomain on the Endpoint in the resource Overview page, for example, 'https://[SUBDOMAIN].cognitiveservices.azure.com/')

Once you have these values, create a new file called .env, and paste the following code into it, supplying your custom property values from above. Do not include quotation marks or the “{” and “}” characters.


Be sure not to commit this file into source control, as it contains secrets that should not be made public.

Next, open app.js and add the following to the top of the file. This loads the properties defined in the .env file as environment variables into Node.


Open the routes\index.js file and replace its content with the following code.

This code creates an API endpoint that acquires an Azure AD authentication token using your service principal password. It also retrieves the subdomain. It then returns an object containing the token and subdomain.

var request = require('request');
var express = require('express');
var router = express.Router();

router.get('/getimmersivereaderlaunchparams', function(req, res) {
    request.post ({
                headers: {
                    'content-type': 'application/x-www-form-urlencoded'
                url: `https://login.windows.net/${process.env.TENANT_ID}/oauth2/token`,
                form: {
                    grant_type: 'client_credentials',
                    client_id: process.env.CLIENT_ID,
                    client_secret: process.env.CLIENT_SECRET,
                    resource: 'https://cognitiveservices.azure.com/'
        function(err, resp, tokenResponse) {
                if (err) {
                    return res.status(500).send('CogSvcs IssueToken error');

                const token = JSON.parse(tokenResponse).access_token;
                const subdomain = process.env.SUBDOMAIN;
                return res.send({token: token, subdomain: subdomain});

/* GET home page. */
router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });

module.exports = router;

The getimmersivereaderlaunchparams API endpoint should be secured behind some form of authentication (for example, OAuth) to prevent unauthorized users from obtaining tokens to use against your Immersive Reader service and billing; that work is beyond the scope of this tutorial.

Launch the Immersive Reader with sample content

  1. Open views\layout.pug, and add the following code under the head tag, before the body tag. These script tags load the Immersive Reader SDK and jQuery.

  2. Open views\index.pug, and replace its content with the following code. This code populates the page with some sample content, and adds a button that launches the Immersive Reader.

    extends layout
    block content
          h2(id='title') Geography
          p(id='content') The study of Earth's landforms is called physical geography. Landforms can be mountains and valleys. They can also be glaciers, lakes or rivers.
          div(class='immersive-reader-button' data-button-style='iconAndText' data-locale='en-US' onclick='launchImmersiveReader()')
            function getImmersiveReaderLaunchParamsAsync() {
                    return new Promise((resolve, reject) => {
                                url: '/getimmersivereaderlaunchparams',
                                type: 'GET',
                                success: data => {
                                error: err => {
                                        console.log('Error in getting token and subdomain!', err);
            async function launchImmersiveReader() {
                    const content = {
                            title: document.getElementById('title').innerText,
                            chunks: [{
                                    content: document.getElementById('content').innerText + '\n\n',
                                    lang: 'en'
                    const launchParams = await getImmersiveReaderLaunchParamsAsync();
                    const token = launchParams.token;
                    const subdomain = launchParams.subdomain;
                    ImmersiveReader.launchAsync(token, subdomain, content);
  3. Our web app is now ready. Start the app by running:

    npm start
  4. Open your browser and navigate to http://localhost:3000. You should see the above content on the page. Click the Immersive Reader button to launch the Immersive Reader with your content.

Specify the language of your content

The Immersive Reader has support for many different languages. You can specify the language of your content by following the steps below.

  1. Open views\index.pug and add the following code below the p(id=content) tag that you added in the previous step. This code adds some content Spanish content to your page.

    p(id='content-spanish') El estudio de las formas terrestres de la Tierra se llama geografía física. Los accidentes geográficos pueden ser montañas y valles. También pueden ser glaciares, lagos o ríos.
  2. In the JavaScript code, add the following above the call to ImmersiveReader.launchAsync. This code passes the Spanish content into the Immersive Reader.

      content: document.getElementById('content-spanish').innerText + '\n\n',
      lang: 'es'
  3. Navigate to http://localhost:3000 again. You should see the Spanish text on the page, and when you click on Immersive Reader, it will show up in the Immersive Reader as well.

Specify the language of the Immersive Reader interface

By default, the language of the Immersive Reader interface matches the browser’s language settings. You can also specify the language of the Immersive Reader interface with the following code.

  1. In views\index.pug, replace the call to ImmersiveReader.launchAsync(token, subdomain, content) with the code below.

    const options = {
        uiLang: 'fr',
    ImmersiveReader.launchAsync(token, subdomain, content, options);
  2. Navigate to http://localhost:3000. When you launch the Immersive Reader, the interface will be shown in French.

Launch the Immersive Reader with math content

You can include math content in the Immersive Reader by using MathML.

  1. Modify views\index.pug to include the following code above the call to ImmersiveReader.launchAsync:

    const mathML = '<math xmlns="https://www.w3.org/1998/Math/MathML" display="block"> \
      <munderover> \
        <mo>∫</mo> \
        <mn>0</mn> \
        <mn>1</mn> \
      </munderover> \
      <mrow> \
        <msup> \
          <mi>x</mi> \
          <mn>2</mn> \
        </msup> \
        <mo>ⅆ</mo> \
        <mi>x</mi> \
      </mrow> \
      content: mathML,
      mimeType: 'application/mathml+xml'
  2. Navigate to http://localhost:3000. When you launch the Immersive Reader and scroll to the bottom, you’ll see the math formula.

Next steps

#nodejs #azure #immersive-reader

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Create Node.js Web App to Launch the Immersive Reader
Aria Barnes

Aria Barnes


Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

  • quick execution and information preparing; 
  • exceptionally reusable code; 
  • the code is not difficult to learn, compose, read, and keep up; 
  • tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.


Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

Original Source

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Node JS Development Company| Node JS Web Developers-SISGAIN

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Harry Patel

Harry Patel


A Complete Process to Create an App in 2021

It’s 2021, everything is getting replaced by a technologically emerged ecosystem, and mobile apps are one of the best examples to convey this message.

Though bypassing times, the development structure of mobile app has also been changed, but if you still follow the same process to create a mobile app for your business, then you are losing a ton of opportunities by not giving top-notch mobile experience to your users, which your competitors are doing.

You are about to lose potential existing customers you have, so what’s the ideal solution to build a successful mobile app in 2021?

This article will discuss how to build a mobile app in 2021 to help out many small businesses, startups & entrepreneurs by simplifying the mobile app development process for their business.

The first thing is to EVALUATE your mobile app IDEA means how your mobile app will change your target audience’s life and why your mobile app only can be the solution to their problem.

Now you have proposed a solution to a specific audience group, now start to think about the mobile app functionalities, the features would be in it, and simple to understand user interface with impressive UI designs.

From designing to development, everything is covered at this point; now, focus on a prelaunch marketing plan to create hype for your mobile app’s targeted audience, which will help you score initial downloads.

Boom, you are about to cross a particular download to generate a specific revenue through your mobile app.

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Hire Node.JS Developers | Skenix Infotech

JavaScript thrives in building dynamic web applications, the Internet of Things, and microservices. It’s increasing traction faster than any other technology also ranks in the top most-in-demand developer skills. The most important advantages of Node.js includes building real-time web apps.

Get the top-quality Node.js development services from Skenix Infotech, contact now to know more about our Node.js services & pricing: https://www.skenix.com/

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