TECHNICAL SEO
JavaScript SEO Dependency Checker
Google renders JavaScript, but later and not always fully, and most other crawlers, including many AI crawlers, read only the HTML the server sends. A page whose content, links or canonical arrive by script is partly invisible to them. This checker shows that first HTML.
- Checks the live page
- Public addresses only
- Free, no sign-up
- CheckApp-shell pages with no content in the HTML
- CheckTitle, meta description, canonical and H1 present in the HTML
- CheckInternal links in the HTML, and links without real URLs
- CheckInline script size and framework markers
Free
no sign-up
Live
fetched when you run the check
4 checks
what the tool looks at
30 a minute
checks per visitor, to keep it free
Loading the tool…
HOW IT WORKS
How to use the JavaScript SEO Dependency Checker
One public page URL.
Enter a page URL, ideally a key template such as a product or article page.
Fix anything marked missing by rendering it on the server.
Check internal links use real hrefs.
WHAT IT CHECKS
What it looks at, and how to read it.
Checks on what is missing from the server’s HTML, and counts of scripts, links and text.
What it checks
- App-shell pages with no content in the HTML
- Title, meta description, canonical and H1 present in the HTML
- Internal links in the HTML, and links without real URLs
- Inline script size and framework markers
How to read the results
- Server-side rendering or static generation puts the content in the first HTML for every crawler.
The concepts behind it, in the SEO glossary: Rendering, Interaction to Next Paint.
GOOD TO KNOW
Common mistakes, an example and the limits.
Common mistakes
- Navigation built from buttons with click handlers instead of links.
A worked example
A React storefront’s product pages have a title and canonical in the HTML but no product text and no links, so AI crawlers see an empty page.
Limitations
- Reads the server’s HTML only. Google renders JavaScript later, so something missing here may still reach Google, slower.
- Framework detection uses markers in the HTML and can miss custom builds.
FAQ
Questions about the JavaScript SEO Dependency Checker
Straight answers about what it does and where its limits are.
Does Google index JavaScript content?
Usually, after rendering. Other search engines and AI crawlers often do not, and rendering can be delayed.
Need this for a whole website, over time?
The NdovuSEOLabs platform connects your own Search Console, analytics and server logs, and audits every page on a schedule.