Web Programming TutorialsJavaScript Crawling: Future Technology Of Dynamic Websites

JavaScript Crawling: Future Technology Of Dynamic Websites

Today, as we can see the growing and evolving nature of the internet, one can find various websites online. However, one of the most extended debated subjects, when we talk about the role of search engine optimization in web development- should we use JavaScript and is it really a good idea when optimizing a website for search engines? The most exciting aspect is that online crowd is divided; while there is one section of people who firmly is against the usage of Java and accept that it should not be used, while the other part thinks that the usage of JavaScript is essential as it backs a lot in the complete success of a website.

What is JavaScript?

JavaScript is a flexible programming language, which can be continuously implemented by numerous web browsers. Apart from HTML and CSS, it’s an essential element of web technology. While HTML is more applicable for structure, and CSS is responsible for style, JavaScript, on the other hand, facilitated much-needed interactivity to the entire website pages in the browser. Now, for any individual looking forward to becoming a web developer must acquire familiarity with this language.

Apart from this, proper usage of Java on a website provides the right solution to the most common issue of code bloat. Code bloat is nothing but can be considered as a condition where the size of an HTML file is utilized for a specific webpage. You must not forget that when even a single webpage of your website goes outside the specified limits of codes, you are entitled to pay the penalty for a lower ranking in the results pages, and this is not good news.

JavaScript Crawling

As of now, we are well aware of the fact that search engine bots like Google were not that much efficient in crawling or indexing the content that was created dynamically using JavaScript. In fact, they were just able to view that was present in the static HTML source code. However, gradually Google, in particular, kept evolving and thus disparaging their previous AJAX crawling scheme guidelines of escaped-fragment #! URLs and HTML snapshots, and are generally now able to concentrate and understand different web pages like a most advanced browser.


Though Google is ordinarily capable of rendering website pages, last year they restructured their relevant guidelines to endorse dynamic rendering. But with the growing popularity of the usage of JavaScript, and embracing of Google’s own JavaScript MVW framework AngularJS, other frameworks such as Single Page Applications (SPA) or even progressive web apps (PWA) are too on the rise.

Nowadays, it is getting essential to read the Document Object Model (DOM) after JavaScript come into play and constructed the web page. It also thoroughly understands the differences between the original response HTML, when crawling and evaluating websites.

If we talk more about JavaScript and dynamic content based websites, then we must note that a crawler always read and analyze the Document Object Model (DOM). A site would require to be rendered once it gets loaded and after dealing out all the code.

basic overview

The crawling phase is entirely about discovery. The process might appear a bit complicated, but with the use of programs called spiders (or web crawlers), it can be more effective and the best example for the sam is Googlebot.
In general, the crawlers start its process first by fetching the web pages and after that follow the links on the page, draw those required web pages. After that, it supports the links on those web pages and only to the point just where pages are indexed. For this technique, the crawler makes use of a parsing module, which then analyses the source code and after that excerpts any URLs found in the  script. Crawlers can authenticate HTML code and hyperlinks.

A “robots.txt” file actually assists in telling search engines if it has the right to use and crawl your entire website pages or just some parts. With the help of this method, you give Googlebot right to access to the code data. The robots.txt file can be used to allow Google precisely what you are looking forward to seeing, or else you will have pages that will be accessed, but you don’t want to be indexed. However, with the help of this tool, you can manage or block different crawlers. However, before using your robots.txt file, check it as most robots.txt files include the XML sitemap address that further upsurges the crawl speed of bots. It can be a good advantage for your website.

The popularity of JavaScript Crawling

Undoubtedly, in a short period, JavaScript has become an enormous hit because it actually helped in turning or redefining web browsers into application platforms. Here are a few facts:

1. JavaScript allows web developer to use it in both the back-end or front-end of web development.
2. JavaScript is a standardized framework, and thus, it allows performing frequent updates with every new version.
3. JavaScript operates with the document object model (DOM), which allows giving an adequate response as the user’s interactions. The DOM is the structure in the browser that displays web pages.
4. JavaScript facilitates the website to have easy interactivity very similar to scroll transitions and object movement. Modern browsers still consider and process JavaScript as the fastest for the ideal and interactive user experiences. In fact, we must not forget that Google Chrome, which is the most used Internet browser these days, has been so fruitful just because of its aptitude to process JavaScript rapidly.

Apart from all these, JavaScript provides a wide range of libraries and frameworks that can very well assist web developers built the complex applications quickly. It allows the programmers to just import frameworks and libraries in their code and further boost the functionality of the application.

JS for Servers

Let us not go too back when big platforms such as Facebook and Google started using JavaScript to program the back-end. JavaScript assisted many different businesses scale to new heights. And, many engineers who knew JavaScript applied in server-side contexts.

Server-side JavaScript too gained enormous popularity as it also facilitated for the scalability that was much required in cloud computing. In the server, one can integrate JavaScript with other languages to perform easy and effective communication with databases. Browsers featured with engines can process JavaScript fast, which further cheered more server-side usage.

What JavaScript Can Do?

Today apart from the web, JavaScript is also being used in various other innovative technologies like gaming or virtual reality. JavaScript is also ideally recommended for rendering and scaling. Nowadays, JavaScript is also being used in the internet of things, which is a technology making simple objects, work smarter. Different devices used every day can become interactive by making proper use of JavaScript libraries.


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