Why is server-side rendering (SSR) important for search engines?

Search engines (e.g., Google, Yandex) scan web pages to index their content. JS code on pages is executed after the HTML loads. SSR allows serving search engine bots fully rendered HTML with content, without the need to execute JS. This is crucial for several reasons:

• Faster indexing: The bot receives ready-made content immediately, without wasting time executing JS and waiting for data to load. This speeds up crawling and indexing.
• Full content access: Not all JavaScript can be successfully executed by search bots. With SSR, content is guaranteed to be available in the source HTML.
• Improved ranking: Search engines prefer fast-loading and accessible content. SSR contributes to this, potentially improving search rankings.
• Content understanding: It is easier for bots to analyze the semantics and structure of the page when all content is present in HTML.
• Handling SPA: For single-page applications (SPA), which heavily rely on JS to generate content, SSR is critical for search engines to see their content at all.

Thus, SSR provides better content accessibility for search bots, which directly affects site indexing and ranking.