Progressive Web App Development - Technical Components of PWA

06 Nov. 2019

Progressive web app development

Our previous blog introduced you to the fundamental concept of a progressive web app (PWA). PWA technology is basically a software that enables to create websites having mobile apps like features and functionality. Built on the lines of intelligent caching, PWA stores the HTML files, CSS files and images in the browser cache which makes possible, the instant page load of the PWA. Progressive web app development enhances user experience as they facilitate offline website access, background data synchronization, push notifications, so on and so forth.

Frameworks like React, Angular, Vue.js etc can be used for writing progressive web app.

Progressive web app development example

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Ofcourse, behind the scenes of this PWA, is a very important technical structure consisting of various service components namely the service worker, the web app manifest.json and the HTTPS. Let us look at each of them one by one.

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Progressive web app development - Service worker

Progressive web app development service worker

-A service worker, in a progressive web app development, essentially is as an intermediary or agent between the browser/application and the server/network, that is responsible to process network requests i.e receive browser requests and send it to the server and receive server response and send it to the browser.

-It is the service worker that is in charge of caching the first-time page load (when online) through the browser’s cache API, and return the cached page to the user in offline mode, that helps in instant page loading. Therefore, the speed of PWA’s is comparable to the speed of native applications.

-The push notification feature of the progressive web app, is also a task performed by the service worker. It takes care of the popping up of the prompt for recording any user action and saving it on the server for future services.

-The service worker plays an important role in background data synchronizations for new updates/features.

-It is basically a JavaScript code that runs outside of the PWA.

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Progressive web app development - Manifest.json

Progressive web app development manifest json

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-In general, a manifest.json file stores the metadata about the progressive web app(PWA). Information like the name of the application, the URL at which the app should be launched, details about the icon displayed on the home screen etc. are stored in the file.

-In progressive web app development, the manifest.json allows the developer to control the display aspect and appearance of the PWA. Modifications like full screen display, launching from the home screen, adding icons to the home screen can be controlled using the manifest.json file.

-Manifest.json also enables you to customize splash screens similar to native applications.

Progressive web app development manifest features

Progressive web app development - HTTPS

It is imperative that the web app must be delivered through a secure protocol (https),in order to be a progressive web app (PWA). Hence, obtaining an SSL certificate is a prerequisite for progressive web apps development.

Progressive web app development https

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Progressive web app development - Conclusion

The giant Google indexes progressive web app (PWA) and ranks them higher than normal websites in their SERPs. There have been several success stories of companies who migrated to progressive web app development and were not only able to increase organic search traffic, but convert them into potential customers. In all aspects, PWA is an excellent technology using advanced web capabilities to serve native mobile app-like experience.

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