What does Google say about SEO? /
This category compiles all official Google statements regarding JavaScript and technical aspects of search engine optimization. Modern JavaScript frameworks (React, Angular, Vue.js) and web application architectures (SPA, SSR, CSR) present critical challenges for crawling and indexing. Google's guidance on JavaScript rendering, dynamic DOM manipulation, AJAX implementation, and API calls is essential for ensuring client-side content visibility. SEO professionals will find authoritative positions on implementation best practices, differences between server-side and client-side rendering, and recommendations for optimizing load times while guaranteeing content accessibility to search crawlers. Understanding data formats (JSON, XML) and their SEO implications completes this vital resource. These official declarations help prevent common technical implementation mistakes that can severely impact the search performance of modern websites and JavaScript-powered applications. Access to Google's verified positions on these technical matters enables practitioners to make informed architectural decisions and implement JavaScript solutions that maintain strong organic search visibility while delivering enhanced user experiences.
Quick SEO Quiz

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🕒 ~1 min 🎯 5 questions
★★★ Should you really modify the lastmod of the sitemap to speed up recrawling after fixing missing tags?
After correcting pages missing title and meta description tags, the recommended method to speed up recrawling is to update the 'lastmod' date in the XML sitemap. This is not gaming: these pages have g...
John Mueller Aug 11, 2020
★★ Is it true that structured data makes a difference based on whether it's implemented with a plugin or manually?
Google accepts structured data implemented via a WordPress plugin, theme, manual code, or JavaScript after the page loads, with no preference. Only the validity of the final structured data counts. Fo...
John Mueller Aug 11, 2020
★★ Why does the mobile-friendly test produce conflicting results on the same page?
The mobile-friendly test can yield varying results (partially loaded, not mobile-friendly, mobile-friendly with missing resources) for the same page tested at different times. This happens because Goo...
John Mueller Aug 11, 2020
★★ Should you manually code your structured data or opt for a WordPress plugin?
Both approaches work perfectly. Google accepts structured data whether it comes from a plugin, a theme, a manual addition, or JavaScript after page load. From a practical standpoint, using a plugin al...
John Mueller Aug 11, 2020
★★ Why are your rich results disappearing from regular SERPs while they technically work?
To determine if the absence of rich results is due to a technical issue or quality assessment, perform a 'site:' query for your domain. Google typically shows rich results in these queries even if the...
John Mueller Aug 11, 2020
★★ How long does it take to recover traffic after a 301 redirect bug?
After a URL change with 301 redirects, if the new URLs have been crawled and then disappeared due to a bug (redirecting to 404), Google sees them as deleted and removes them from the index. Reindexing...
John Mueller Aug 11, 2020
★★ Should you really separate sitemaps for pages and images?
A single sitemap file can contain both page URLs and images. There are limits on the number of URLs and file size, but how you divide sitemaps generally has no impact on crawling and indexing, except ...
John Mueller Aug 04, 2020
★★ Should you serve a streamlined version of your pages to Googlebot to improve crawl efficiency?
Serving a faster page to Googlebot (without trackers or pixels) is not considered cloaking and is similar to server-side prerendering. However, this practice is discouraged because it introduces unnec...
John Mueller Aug 04, 2020
★★★ Can you create local pages by city without risking penalties for doorway pages?
Creating city-specific landing pages can be acceptable if each page offers true unique value (special offers, local reviews, popular models in that city). Avoid: generic auto-generated content about t...
John Mueller Aug 04, 2020
★★ Is it really necessary to use hreflang for a multilingual website?
For versions in truly different languages (English, Spanish, German), hreflang is often not required because users search in their language and Google naturally displays the correct version. Hreflang ...
John Mueller Aug 04, 2020
★★ How does my site get included in the Chrome User Experience Report without signing up?
Inclusion of a site in the Chrome User Experience Report (CrUX) is automatic, based on a sample of Chrome traffic. There is no manual registration required. Sites can also collect their own Core Web V...
John Mueller Aug 04, 2020
★★★ Why is your Search Console crawl budget skyrocketing for no apparent reason?
The number of URLs crawled per day in Search Console includes all Googlebot requests: HTML, images, CSS, JavaScript, server responses, and also checks for landing pages for Google Ads and Shopping. Th...
John Mueller Aug 04, 2020
★★ Should you create a lightweight version for Googlebot to speed up crawling?
Removing trackers and pixels to speed up the version served to Googlebot is probably not considered cloaking (akin to server-side prerendering). However, this adds no value because Google measures spe...
John Mueller Aug 04, 2020
★★ Why is your Search Console crawl budget skyrocketing for seemingly no reason?
Crawl statistics in Search Console include all crawled URLs (HTML, images, CSS, JS, server responses) and all requests passing through the Googlebot infrastructure, including checks for advertising an...
John Mueller Aug 04, 2020
★★ How can you measure Core Web Vitals when your site isn't in CrUX?
When a site does not appear in the Chrome User Experience Report, it is possible to use the Core Web Vitals JavaScript library to collect this data directly in Analytics. This approach allows you to o...
John Mueller Aug 04, 2020
★★ Should you isolate UGC and News content in subdomains to avoid penalties?
For Google to treat a News section and a forum separately on the same domain, there needs to be a clear separation: different subdomains or distinct directories (/news and /forum). User-generated cont...
John Mueller Aug 04, 2020
★★★ Should You Use Images Instead of HTML/JavaScript Charts for SEO?
John Mueller explained during a webmaster hangout that using images (PNG, JPG or other formats) was preferable (with a properly filled ALT attribute) when displaying charts on screen compared to other...
John Mueller Aug 03, 2020
★★ Do Google's new JavaScript guides on links and navigation really change the game?
Google has expanded its documentation for JavaScript sites, adding information on links, the History API, URL fragments, and 404 pages. These resources are recommended for developers of JavaScript-bas...
John Mueller Jul 31, 2020
★★★ Is it really necessary to aim for a Lighthouse score of 100 to rank better on Google?
Google does not rank pages based on a specific Lighthouse score. Pages are categorized into groups (slow, average, fast). Moving from a Lighthouse score of 90 to 95 does not make a difference for the ...
Martin Splitt Jul 27, 2020
★★★ How Can You Successfully Migrate Your Website Without Losing Your Organic Rankings?
John Mueller provided some insights on Reddit regarding website migration. First of all, if there are changes, they will primarily come from a new CMS and/or new content, not from a domain name change...
John Mueller Jul 27, 2020
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