September 21, 2023

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

If that’s the case, you should use our Web site Audit device 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 all the pieces too. Now, our Web site Audit bots render JavaScript in the identical method to determine any hidden points in your website. 

Right here’s how we had been in a position to try this. 

What’s New in Web site Audit?

We’ve allotted extra assets so we are able to crawl and render your website’s JavaScript. This implies we are able to accurately 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:

Here 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 could actually correctly determine the problems that have to be mounted. 

How Does JavaScript Influence web optimization and Why Does It Matter?

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

How these recordsdata flip from strains 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? In brief, it comes right down to assets.

Google has the assets 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 assets 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 will 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:


Prior 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 may not see the total image of your website’s points with out enabling JS in your subsequent website crawl. 

Enabling JS may aid you discover related points that had been doubtlessly missed earlier than.

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

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


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 assets 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

While 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 won’t have an effect on your limits in the event you select to allow JS on Web site Audit. Nevertheless, solely these with Guru or Enterprise subscriptions can use this characteristic.

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

No, Web site Audit won’t 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. 

Easy methods to Crawl Your Web site’s JS with Web site Audit

Crawling your website’s JS with Web site Audit is easy. First, go to the Web site Audit device and click on the ‘create challenge’ button. 


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


You’ll be able to examine in case your audit is rendering your website’s JS by wanting up right here within the report: 


Easy methods to Crawl an Present Challenge’s JS with Web site Audit

If JS rendering isn’t enabled on a present challenge, you’ll be able to 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’ll be able to disable JS rendering in the identical approach 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 net doc for a speedy, seamless expertise. 

Equally, many web sites use the app shell mannequin (in addition to client-side rendering) to profit each the consumer agent and the location proprietor in their very own methods. Your website could use JS to attain the identical outcomes. And in case your website does, we are able to determine what points Google could run into with Web site Audit’s new JS rendering characteristic.