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Master Canonicalization with Google’s JavaScript SEO Update

```json { "alt": "Google logo overlaying colorful source code on a dark background, indicating technology and programming.", "caption": "The iconic Google logo interacts with vivid lines of code, symbolizing the tech giant's deep integration into the world of programming and development.", "description": "This image features the Google logo prominently displayed over a background of colorful, glowing source code. The code, in shades of yellow, red, blue, and orange, appears on a black screen, creating a high-contrast visual effect. The composition highlights Google's connection to technology, programming, and innovation. Keywords: Google, logo, source code, technology, programming, innovation." } ```

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Earlier this week, I noticed Google made another tweak to its JavaScript SEO best practices document. This time, they focused on clarifying canonicalization best practices. In essence, Google suggests that setting the canonical URL to match the URL in the original HTML is crucial. If that’s not possible, it’s better to leave the canonical URL out of the HTML altogether.

Google’s New Additions. Google introduced a fresh section that explains:

“The rel=‘canonical’ link tag helps Google identify a page’s canonical version. While you can use JavaScript for this, it shouldn’t alter the canonical URL from what’s set in the original HTML. Ideally, use HTML to set it, but if JavaScript is necessary, ensure the JavaScript sets it identically to the HTML. If HTML isn’t an option, use JavaScript and omit the canonical URL in the HTML.”

Understanding Google’s Stance on Noindex. They also issued a warning earlier regarding noindex tags—advising not to use them in the original page code if you want the page indexed.

Why This Matters to Me. If I rely on JavaScript for setting canonical links, Google’s advice is to verify its recognition through the Google Search Console’s URL Inspection tool. It’s a great reminder to review these updated best practices, especially if JavaScript plays a crucial role on my site.

Inspired by this post on Search Engine Land.

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FAQs

What did Google clarify about JavaScript SEO and canonicalization?

Google clarified that JavaScript should not change the canonical URL from what appears in the original HTML. Ideally, the canonical should be set in HTML, or JavaScript should set the same URL if JavaScript must be used.

Should the canonical URL in JavaScript match the canonical URL in the original HTML?

Yes. The post states that Google suggests setting the canonical URL to match the URL in the original HTML, and that JavaScript should not alter it.

What should I do if I cannot set a canonical URL in the original HTML?

If setting the canonical in HTML is not possible, the article says it is better to omit the canonical URL from the HTML and use JavaScript instead. The key point is to avoid sending conflicting canonical signals.

How can I check whether Google recognizes my JavaScript canonical link?

The article recommends verifying Google’s recognition through the Google Search Console URL Inspection tool. This is especially important for sites where JavaScript plays a major role.

What warning did Google give about noindex tags?

Google warned not to use noindex tags in the original page code if you want the page indexed. A noindex directive in the original code can prevent the page from being indexed.

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