Javascript and SEO
-
I've done a bit of reading and I'm having difficulty grasping it. Can someone explain it to me in simple language?
What I've gotten so far:
-
Javascript can block search engine bots from fully rendering your website.
-
If bots are unable to render your website, it may not be able to see important content and discount these content from their index.
-
To know if bots could render your site, check the following:
-
Google Search Console Fetch and Render
-
Turn off Javascript on your browser and see if there are any site elements shown or did some disappear
-
Use an online tool Technical SEO Fetch and Render
-
Screaming Frog's Rendered Page
-
GTMetrix results: if it has a Defer parsing of Javascript as a recommendation, that means there are elements being blocked from rendering (???)
Using our own site as an example, I ran our site through all the tests listed above. Results:
- Google Search Console: Rendered only the header image and text. Anything below wasn't rendered. The resources googlebot couldn't reach include Google Ad Services, Facebook, Twitter, Our Call Tracker and Sumo. All "Low" or blank severity.
- Turn off Javascript: Shows only the logo and navigation menu. Anything below didn't render/appear.
- Technical SEO Fetch and Render: Our page rendered fully on Googlebot and Googlebot Mobile.
- Screaming Frog: The Rendered Page tab is blank. It says 'No Data'.
- GTMetrix Results: Defer parsing of JavaScript was recommended.
From all these results and across all the tools I used, how do I know what needs fixing? Some tests didn't render our site fully while some did. With varying results, I'm not sure where to from here.
-
-
Thanks! We probably should have combined JS with CSS and not built a site fully reliant on JS. This looks like what our competitors have done.
-
Thanks so much for the very helpful insights and for running our website through tests, I appreciate it. I'll try running the site on lighthouse. I agree we do have speed issues that we need to solve. Our page is also not showing up at all with GSC fetch and render.
Also, I tried Googling our brand + content within the expanding tabs and some did not show up on the SERPs. All other content not in expanding tabs showed up. I know Google still reads and indexes tabbed content but treats it with less importance. But I guess, not all of it will get indexed.
Thanks again!
-
Thanks for the response Nikki, I'll try to be as thoughtful about this as I can, but I am somewhat skeptical that your problem is javascript. It may be a contributing factor, but in general the concern that most SEOs would have with java is that Google can't crawl it and effectively the content rendered by java is invisible, making it completely impossible to rank as your page is deindexed, and yeah, this is a real risk. The fact that you're on page 1 right now for a competitive term though means that isn't likely your issue. And you're on a Wordpress site, so most of the js issues aren't going to be a problem for you, unless you're using an Angular integrated theme or something.
That doesn't mean there aren't any technical issues holding you back. I ran your page through a couple tools and I'm finding that the page is very heavy, slow to load, and has a very low performance score in terms of page load times and part of that is how js heavy your webpage is. I would recommend running your page through any of the free tools out there. The lighthouse extension for Chrome isn't great, but it was developed by Google so it gives you an idea how they might be measuring your page. Your page scored a performance rating of 4 out of 100, which again, big indication you have speed problems related to your js that could be tied to your rankings.
I think you're on the right track to investigate technical performance issues, but the easiest way to track this down is to start by making sure you don't have content that isn't being indexed. From there you should be able to see if there's any js that's blocking content from rendering for Googlebot. If Google is crawling and indexing the content, your js is okay from a visibility perspective and you can focus on the performance aspect.
If Google is displaying the page completely with fetch and render, you're probably okay, but try going into Chrome Dev Tools and disabling the cache, then reloading the page. Watch for any errors and try running lighthouse with that open. You'll probably be able to catch errors that way.
Good luck!
-
Hi Brett, thanks for your response, I've read a couple recently published articles, but this was the one that stood out - https://www.elephate.com/blog/ultimate-guide-javascript-seo/ and kinda alarmed me.
There is a part there that says: there is virtually no real life case of a client rendered JS website/brand/store ranking high. So I can’t guarantee that your JavaScript-rich website will rank as high as its HTML equivalent.
Our site was built on WordPress, but predominantly JavaScript. We have been really working a lot on on page content and link building the past 6 months, but we could not beat our competitors in the top 3 for the keyword 'seo brisbane'. The closest we've gotten was #6. We've been monitoring their sites as well and it looks like only 1 is doing active link building. The others seemed to be just cemented there.
We're looking at other reasons why we're not moving up and Javascript is one of them.
We have other sites we manage that are also experiencing slow progress. So you are right, my question is centered on how Javascript sites affect SEO and how to know if it's the culprit and how to fix.
Thanks!
-
Hey Nikki, I think your specific question is more centered on "Will having a website that is only fully enabled with Javascript be harmful to SEO?"
First, there's a lot of mythology about this in SEO land. There are outdated resources and it looks like you've read some of them. Google has advanced their ability to crawl and understand js and the content behind it to a very advanced degree and the tools you may use as proxies to understand Google's capabilities aren't so effective.
But before I move on, I want to verify something with you. When you're talking about javascript, are you specifically looking for answers regarding a website like WIX, built with AJAX? Because that can change my answer significantly.
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
Browse Questions
Explore more categories
-
Moz Tools
Chat with the community about the Moz tools.
-
SEO Tactics
Discuss the SEO process with fellow marketers
-
Community
Discuss industry events, jobs, and news!
-
Digital Marketing
Chat about tactics outside of SEO
-
Research & Trends
Dive into research and trends in the search industry.
-
Support
Connect on product support and feature requests.
Related Questions
-
WordPress Themes and SEO
I am helping out a client with updating their website.
Intermediate & Advanced SEO | | cangelmarketer
The theme they currently have hasn't been updated in ages (I am going to guess years). Would there be a difference in updating to the most recent version of their theme and changing them to a completely different theme? Or because they update in the current theme is so large anyway, it won't make a difference in terms of SEO. The reason I ask is that they don't know their Themeforest details to log in and download the most recent version of the theme, so they would have to re-purchase it, and with the hosting, they have access to a range of themes includes in their package. Thanks0 -
Multi-Store SEO
I am currently developing a website which will have a multi-store function, i.e. one for US & ROW customers and one for UK & EU customers. The domain names will be along the lines of: Original domain: www.website.com UK & EU domain: eu.website.com US & ROW domain: us.website.com When a customer visits the website they will be redirected to one or the other depending on their location. Can anyone see any problems which this may cause in respect to SEO? I know there may be a duplicate content issue here also, how should I best deal with this?
Intermediate & Advanced SEO | | moon-boots0 -
Proxy Servers & SEO
Does putting a blog on a proxy server (the pointed at the main site) hurt SEO? i.e. can Google tell? And if they can, does it matter? My server people won't use PHP on their servers but we want a Wordpress blog. So their suggested solution is that they put the blog on a proxy server and point it at the ourdomain.com/blog subfolder on our site. So to all intents and purposes it's hosted in the same place. They assure me this is normal practice and point out that our (main site) images are already being sourced from a CDN. Obviously we'll deal with Google not seeing two separate versions of the same site. But apart from this, is there any negative effect we could suffer from in SEO terms?
Intermediate & Advanced SEO | | abisti20 -
Which automatic redirects to use in International SEO
Hi, I need help with international SEO redirects. I'm going to have intelligencebank.com/au for Australian visitors and intelligencebank.com for the rest of the world. I would like to automatically redirect aus users that land on .com to .com/au and vice versa for non-australian users. 1. Which automatic redirects should I use: a) java script because it will allow US based google bots to crawl my /au website (bots won't read javascript so they won't be redirected) b) http redirects c) 301 redirects d) 302 redirects e) anything else? a) Should I still use rel alternate even though I only use english? b) if I should add rel alternate, can I still keep my existing rel canonical tags that are use to avoid duplicate content (I use a lot of utm codes when advertising)
Intermediate & Advanced SEO | | intelligencebank0 -
Domain name match and SEO
I was asked a question today and would like a second opinion on it : Knowing that Alex wants to rank for personnal training the question is, from a SEO standpoint, which domain name would you recommend me using and why : personnaltraining.com ( IS not available) Personnaltrainingalex.com alexpersonnaltraining.com alextraining.com trainingalex.com I have my idea on this, but I'd like to have your so we can share and discuss on that. Thanks !
Intermediate & Advanced SEO | | Catalyste0 -
How to be a good SEO optimizer while competing with a good ranked Bad SEO optimizer?
My keywords are very competitive. My on page optimization report gives A grade for all the keywords I want to target to my Root domain. But my root domain does not show up on search engines for those same keywords. So thanks to SEOmoz i have managed to understand the place I lack is good link building. My competitors have done lot of link building through spamming, commenting on blogs, directories etc. Now according to good seo, this is not right. What do i do? I get digging more in it, i realized that i am getting traffic mostly for less globally searched keywords. But my competitors get high traffic from well searched keywords. How do i cope with such competition? Thanks
Intermediate & Advanced SEO | | MiddleEastSeo0 -
Where is the Real Value in SEO?
Interesting topic and would love to hear some thoughts. How do you justify SEO, measure results, etc etc
Intermediate & Advanced SEO | | imageworks-2612900 -
Effects on SEO with CDN
Should we be concerned about any adverse consequences to our site's SEO value when moving the site's assets (javascript files and css files) to a CDN (Akamai)?
Intermediate & Advanced SEO | | Volusion.com0