March 28, 2023

Does your website use JavaScript (JS)? It in all probability does like most web sites.

In that case, you need to use our Web site Audit software to uncover extra points than earlier than.

Google renders your webpages’ unloaded JS to see its full content material and to ensure your on-line guests can simply entry every thing too. Now, our Web site Audit bots render JavaScript in the identical approach to establish any hidden points in your website. 

Right here’s how we had been ready to do this. 

What’s New in Web site Audit?

We’ve allotted extra sources so we are able to crawl and render your website’s JavaScript. This implies we are able to appropriately crawl websites largely constructed on JavaScript, even when they’re client-side rendered. 

To indicate you the distinction, check out a earlier than and after:

This is one audit with JS rendering enabled and one other audit (of the identical website) with JS disabled.


See the massive distinction between the variety of errors and warnings earlier than and after? With JS enabled, it may correctly establish the problems that should be mounted. 

How Does JavaScript Influence search engine optimization and Why Does It Matter?

JavaScript rendering is when a website’s JavaScript information are correctly executed and exhibited to web site guests. 

How these information flip from traces of code to an interactive web site in your browser can occur in just a few methods (like client-side vs. server-side rendering). Every has its professionals and cons. Nevertheless, websites that use JS and client-side rendering may run into crawling issues, particularly for tech audit bots. 

Why does that occur? Briefly, it comes all the way down to sources.

Google has the sources to load each static HTML and injected HTML as soon as a website’s JS is executed. However some website auditing bots don’t have the sources to deal with that process (like ours earlier than this replace). 

Right here’s what Airbnb would appear like to a bot that may’t render JS. 


And right here’s what it could appear like to a bot that may execute and render JavaScript. 


What Occurs When Google Renders a Web site’s JavaScript? 

When Google renders a website’s JavaScript, it first sees if any JS must be executed within the first place. If it does, it goes right into a queue after which will get executed/rendered to disclose the webpage’s full content material. Then, Google indexes it.

Right here’s what that appears like:


Up to now, we weren’t capable of execute that stage above the place a bot processes the JavaScript and renders it. Now our course of is comparable (minus the indexing). 

Why Ought to You Allow JS Crawling in a Web site Audit?

You won’t see the complete image of your website’s points with out enabling JS in your subsequent website crawl. 

Enabling JS may enable you to discover related points that had been probably missed earlier than.

Particularly for websites constructed on the app shell mannequin (the place core parts are loaded, however normally not the majority of a website’s content material—consider the sooner Airbnb instance). 

Some JavaScript websites might use the app shell mannequin the place the preliminary HTML doesn’t comprise the precise content material and Google must execute JavaScript earlier than with the ability to see the precise web page content material that JavaScript generates.

– Google

How Does Web site Audit JavaScript Rendering Work Now?

1. We obtain the preliminary HTML from the net server throughout crawling

2. We load the JS sources which can be linked on this HTML

3. Execute and render JS code 

4. Wait 5 seconds

5. Web site Audit makes use of the ultimate HTML for additional evaluation steps

If you select to disable JS in Web site Audit, we use the unique HTML as we did earlier than. 

Does Enabling JS Have an effect on My Limits? 

No, it is not going to have an effect on your limits should you select to allow JS on Web site Audit. Nevertheless, solely these with Guru or Enterprise subscriptions can use this function.

Will It Set off Trackers, Adverts, and Occasion Handlers? 

No, Web site Audit is not going to set off trackers, adverts, and occasion handlers (i.e. JS triggered by clicking or scrolls). Right here’s what we block when our Web site Audit bot crawls a website: 

  • GA4
  • GA3
  • Yandex Metrica
  • Amplitude
  • Adobe Analytics
  • Google Adverts
  • OWOX
  • SpeedCurve

Does Web site Audit Use Chrome for Rendering JS?

Sure, we use the most recent Chromium rendering engine. So, we use the identical know-how as Google does for crawling. 

How you can Crawl Your Web site’s JS with Web site Audit

Crawling your website’s JS with Web site Audit is straightforward. First, go to the Web site Audit software and click on the ‘create mission’ button. 


Subsequent, it’s going to immediate you to arrange the audit. The one distinction is that you just’ll select ‘enabled’ for ‘JS-rendering’ within the crawler settings. You may nonetheless depart it disabled should you’d like or change it later. 


You may verify in case your audit is rendering your website’s JS by trying up right here within the report: 


How you can Crawl an Present Venture’s JS with Web site Audit

If JS rendering isn’t enabled on a present mission, you may change that within the Web site Audit settings. 


From right here, simply click on the “re-run marketing campaign” button to crawl your website with JS enabled. You may disable JS rendering in the identical method if you wish to change it again later. 

Discover All Of Your Web site’s Points with JS Rendering

JavaScript makes websites extra interactive, dynamic, and customized. For instance, Netflix makes use of JS to replace the physique of a single internet doc for a speedy, seamless expertise. 

Equally, many web sites use the app shell mannequin (in addition to client-side rendering) to learn each the person agent and the positioning proprietor in their very own methods. Your website might use JS to realize the identical outcomes. And in case your website does, we are able to establish what points Google might run into with Web site Audit’s new JS rendering function.