Why can Yoast's REST API return a missing URL response?

Definition: A missing URL response from Yoast's REST API, an interface for reading SEO metadata, can occur when an existing resource lacks data in Yoast's indexables system. Indexables are the site's stored SEO data that Yoast accesses when needed.

Key facts

• As of 17 October 2026, Yoast's REST API documentation identifies missing indexables data as a typical cause of a 404 status for an existing URL.
• Yoast's technical troubleshooting guide says that creating or updating a post normally adds data to indexables.
• The Tools settings guide places the Start SEO data optimization control under Yoast SEO > Tools in the WordPress backend.

How does the URL lookup work?

Yoast's REST API documentation specifies a GET request to the following endpoint. The example queries the SEO metadata for the URL supplied in the url parameter:

https://yoast.com/wp-json/yoast/v1/get_head?url=https://yoast.com/wordpress-seo/

The response contains html, json and status. The html field holds prepared metadata markup; json holds structured values. The status property contains an HTTP status code, typically 200 or 404. The same documentation explains that full responses also exist for genuine missing pages, so response content alone is insufficient to diagnose the cause.

What are the documented repair steps?

For an existing resource, the REST API troubleshooting section recommends saving or updating the object in the WordPress administration interface, or using Optimize SEO Data in Yoast SEO's Tools menu. These are the documented remedies when indexables data is unavailable.

The Tools settings guide gives the navigation path: open Yoast SEO in the WordPress backend, then Tools, and click Start SEO data optimization. It explains that this process builds indexables and gathers content data used for internal linking suggestions.

Yoast's technical guide describes SEO data optimization as a way to initiate indexables creation after installation or when some data has failed to enter that system. Larger sites can take longer to process.

What if SEO data optimization fails?

Yoast's optimization error guide directs attention to the technical summary accompanying the error. Its troubleshooting depends on the reported failure:

• 301 or 302 indicates that the request is redirected away from the correct WordPress API endpoint. The guide recommends checking redirection plugins or server handling.
• 401 or 403 concerns blocked or unauthorized requests. A web application firewall or a disabled WordPress API can cause this.
• For an error parsing the response as JSON, the guide recommends opening the response to inspect what the server sends. Debugging notices and warnings can interfere with communication.

These checks concern the optimization process used to build the missing data.

Related terms

• How do I read Yoast metadata for a headless WordPress site?
• HTTP status codes
• How do I change the URL slug of a WordPress post?

FAQ

Can an existing page produce a missing URL response?

Yes. Yoast's REST API documentation says that an existing post, resource or URL can return 404 when its indexables data is unavailable.

Where can I start rebuilding the SEO data?

In your WordPress backend, open Yoast SEO > Tools and click Start SEO data optimization, as described in Yoast's Tools settings guide.

Sources

1. Yoast, "Yoast SEO: REST API", undated
2. Yoast, "Yoast SEO Tools settings", undated
3. Yoast, "We couldn’t complete the optimization of your SEO data: A technical guide", undated

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