What is JavaScript SEO?

javascript seo

The internet is in a golden age of front-end development, and JavaScript and technical SEO are experiencing a renaissance. As a technical search engine optimization expert and internet dev fanatic at an award-prevailing virtual advertising corporation, I’d want to proportion my angle on current JavaScript SEO based on industry best practices and my very own corporation experience. In this article, you may discover ways to optimize your JS-powered website for seeking in 2022.

JavaScript SEO is the field of technical search engine optimization that’s targeted at optimizing websites constructed with JavaScript for visibility with the aid of using search engines. It’s usually involved with: 

(1) Optimizing content injected through JavaScript for crawling, rendering, and indexing with the aid of using search engines. 

(2) Preventing, diagnosing, and troubleshooting rating problems for websites and SPAs (Single Page Applications) constructed on JavaScript frameworks, consisting of React, Angular, and Vue. 

(3) Ensuring that web pages are discoverable with the aid of using search engines via linking excellent practices. 

(4) Improving webpage load times for pages parsing and executing JS code for a streamlined User Experience (UX). 


Is JavaScript good or bad for SEO? 

It depends! JavaScript is important to the present day internet and makes constructing websites scalable and less complicated to maintain. However, positive implementations of JavaScript may be unfavourable to search engine visibility. 

How does JavaScript affect SEO? 

JavaScript can affect the subsequent on-webpage factors and rating elements which can be essential for SEO: 

  • Rendered content 
  • Links 
  • Lazy-loaded images 
  • Page load times 
  • Metadata 


What are Javascript-powered websites? 

When we speak about websites that are constructed on JavaScript, we’re now no longer related to including a layer of JS interactivity to HTML documents (for example, while including JS animations to a static internet page). In this case, JavaScript-powered websites talk while the core content is injected into the DOM through JavaScript. 


How to check if a website is built with JavaScript? 

You can quickly take a look at if a website is constructed on a JavaScript framework with the aid of using a technology look-up device consisting of BuiltWith or Wappalyzer. You can also “Inspect Element” or “View Source” in the browser to test for JS code. Popular JavaScript frameworks that you may discover include:  

  • Angular by Google 
  • React by Facebook 
  • Vue by Evan You  



JavaScript for core content:  

Here’s an example: Modern internet apps are being constructed on JavaScript frameworks, like Angular, React, and Vue. JavaScript frameworks permit builders to quickly construct and scale interactive internet applications. Let’s check the default project template for Angular.js, a famous framework produced by Google. 

Potential SEO issues: Any core content material that is rendered to customers however not looking for engine bots might be severely problematic! If search engines aren’t capable of absolutely crawling all your content, then your internet site can be unnoticed in support of competitors. We’ll speak about this in greater detail later. 

JavaScript SEO for internal links 

Besides dynamically injecting content into the DOM, JavaScript also can affect the crawl ability of hyperlinks. Google discovers new pages by crawling hyperlinks it reveals on pages. 

As an excellent practice, Google especially recommends linking pages with the use of HTML anchor tags with href attributes, as well as consisting of descriptive anchor texts for the hyperlinks. 

However, Google additionally recommends that builders not depend on different HTML elements — like div or span — or JS event handlers for links. These are called “pseudo” links, and they may usually not be crawled, in keeping with legitimate Google guidelines. Despite these guidelines, an independent, third-party thought has recommended that Googlebot can be capable of crawling JavaScript hyperlinks. Nonetheless, in my experience, I’ve discovered that it’s an excellent exercise to preserve hyperlinks as static HTML elements. 

Potential SEO issues: If search engines aren’t capable of crawling and observing hyperlinks on your key pages, then your pages might be lacking out on precious internal links pointing to them. Internal hyperlinks assist search engines to crawl your internet site more efficaciously and spotlight the maximum crucial pages. The worst-case situation is that in case your internal hyperlinks are applied incorrectly, then Google may also have a difficult time coming across your new pages at all (outside of the XML sitemap). 


JavaScript SEO for page speed 

Javascript also can affect web page load times, which is a legitimate rating element in Google’s mobile-first index. This means that a gradual web page could probably damage ratings in search. How are we able to assist developers to mitigate this? 

  • Minifying JavaScript  
  • Deferring non-essential JS till after the primary content is rendered in the DOM  
  • Inlining crucial JS  
  • Serving JS in smaller payloads 

Potential SEO issues: A slow internet site creates poor consumer enjoyment for everyone, even search engines. Google itself defers loading JavaScript to keep resources, so it’s vital to ensure that any service to customers is coded and brought efficaciously to assist safeguard rankings. 



How to fix JavaScript rendering issues? 

After diagnosing a JavaScript rendering problem, how do you solve JavaScript SEO issues? The solution is simple: Universal JavaScript, also regarded as “Isomorphic” JavaScript.  

What does this mean? Universal or Isomorphic here refers to JavaScript programs that can be run on both the server and the client. There are some exclusive implementations of JavaScript which are more search-friendly than client-aspect rendering, to keep away from offloading JS to each customer and crawlers: 

  • Server-side rendering (SSR).  
  • Hybrid rendering.  
  • Dynamic rendering.  
  • Incremental Static Regeneration, or updating static content after a website has already been deployed. 

Each of these answers allows making certain that, while search engine bots make requests to crawl HTML documents, they obtain the completely rendered variations of the internet pages. However, a number of those may be extremely hard or maybe not possible to enforce after internet infrastructure is already built. That’s why it’s crucial to preserve JavaScript SEO best practices in thought while designing the structure of your subsequent internet application. 

This article provides some popular best practices and insights into JavaScript SEO. However, JavaScript SEO is a complicated and nuanced subject of study. We suggest that you study via Google’s legitimate documentation and troubleshooting manual for more JavaScript.

Credits: https://moz.com/blog/javascript-seo-guide


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1 / 5

Which of the following methods is used to access HTML elements using Javascript?

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Upon encountering empty statements, what does the Javascript Interpreter do?

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Which of the following keywords is used to define a variable in Javascript?

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Which of the following methods can be used to display data in some form using Javascript?

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JavaScript is an _______ language?

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