JavaScript SEO for React and Next.js Websites: Make Sure Google Can See Your Content
Your new website looks beautiful. It has smooth animations, instant page transitions and a modern design, built on React by a talented developer. Three months after launch, however, organic traffic has fallen and many pages are not appearing in Google at all. When you right-click and view the page source, there is almost nothing there: a single empty container and a long list of JavaScript files. The content visitors see is assembled in the browser after the page loads, and that is where the trouble begins.
This is a classic JavaScript SEO problem. Google can process JavaScript, but how your website delivers its content still makes a significant difference to whether, and how quickly, your pages are indexed and ranked.
How Google handles JavaScript websites
In simplified terms, Google first crawls a URL and fetches its HTML. It then renders the page, running the JavaScript to see the final content, and only after that does it index what it finds. Rendering takes computing resources, so it can be delayed. It can also be incomplete if scripts fail, are blocked from loading, or only display content after a user clicks or scrolls.
It is also worth remembering that not every crawler behaves like Google. Some social media preview bots and some AI-related crawlers may not run JavaScript at all. If your important content only exists after JavaScript runs, those systems may see an almost empty page.
Understanding rendering approaches
With client-side rendering, the browser downloads a nearly empty shell and builds the content using JavaScript. This is the riskiest approach for SEO, because everything depends on rendering working perfectly. With server-side rendering, the server sends fully built HTML for each request, so content is visible immediately to both users and crawlers. Static site generation pre-builds pages as HTML when the site is deployed, which works extremely well for content that does not change every minute, such as service pages and blog posts. Many modern sites use a hybrid of these approaches, mixing static and server-rendered pages and refreshing them as needed.
Frameworks such as Next.js support server-side rendering and static generation out of the box, but they must be configured to use them for important pages. Simply choosing a modern framework does not guarantee SEO-friendly output.
Common JavaScript SEO problems
One frequent issue is content that only appears after an interaction, such as text hidden inside tabs or accordions that load on click, or products that only appear through infinite scrolling. Another is navigation built with JavaScript click handlers rather than real links with proper URLs, which crawlers cannot follow. Page titles, meta descriptions and canonical tags set only in the browser may not appear in the initial HTML, leading to inconsistent signals.
Blocking JavaScript files or API endpoints in robots.txt can prevent Google from rendering pages properly. Soft 404 errors, where missing pages return a normal success status instead of a proper "not found", confuse search engines. Older single-page applications sometimes use hash-based URLs, which search engines may treat as a single page. And heavy JavaScript bundles slow pages down, particularly on the mid-range Android phones and mobile connections common in India.
How to see what Google sees
The URL Inspection tool in Google Search Console is the most reliable starting point. Inspect an important page and view the crawled version, which shows the rendered HTML and a screenshot of what Google processed. Next, view the raw page source in your browser rather than using "inspect element"; if your main text is missing from the source, you are relying entirely on rendering. Google's Rich Results Test shows whether structured data survives rendering. Disabling JavaScript in your browser gives a quick view of what non-rendering crawlers see, and SEO crawling tools with JavaScript rendering can compare raw and rendered versions across the whole site.
Practical fixes
Use server-side rendering or static generation for every page that should rank, including the homepage, service pages, product pages, blog posts and location pages. Render titles, meta descriptions, canonical tags and structured data on the server so they are present in the initial HTML. Use real anchor links with clean, descriptive URLs for navigation. Make sure missing pages return proper 404 status codes and moved pages use 301 redirects. Keep JavaScript bundles lean, load non-essential features later, and generate an XML sitemap automatically so new pages are discovered quickly.
Frequently asked questions
Is React bad for SEO?
No. React websites can rank very well when important pages are rendered properly. The risk lies in relying only on client-side rendering.
Do we need to rebuild our website?
Not always. Many frameworks allow adding server rendering or pre-rendering to key pages without a full rebuild.
Does this affect visibility in AI-powered search?
Content clearly present in HTML is easier for all crawlers to access, including those used by AI search tools.
Make your modern website discoverable
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