For a search engine to understand content that’s powered by JavaScript, it has to crawl and render the page. In an SSR setup, the crawler is fed a fully rendered HTML page without requiring extra JS execution and rendering. The JavaScript SEO toolkitThere are certainly tools out there that will help identify JavaScript-related SEO issues. Go to Pages > Page indexing > Crawled – currently not indexed and look for the presence of priority pages within the list. Unloaded JavaScript resources reported by Test Live URL tool in GSCMake friends with JavaScriptYes, JavaScript can come with some SEO issues.