How to do SEO in react

React applications present unique SEO challenges because content is rendered client-side through JavaScript rather than being present in the HTML that search engines initially receive. The most reliable approach is server-side rendering (SSR) using Next.js, which generates fully-rendered HTML on the server before sending it to the browser. This means search engines receive complete, indexable content immediately, just as they would with a traditional website. Next.js handles this elegantly with minimal additional complexity, and it's become the standard solution for agencies building React sites that need strong SEO performance. If you're building for clients who need organic visibility, this should be your default architecture choice rather than a client-side-only React app.

For existing React applications or situations where SSR isn't feasible, static site generation (SSG) or pre-rendering offers an alternative. Tools like Gatsby generate static HTML files at build time, which works well for content that doesn't change frequently. You can also use services like Prerender.io or use Next.js incremental static regeneration to pre-render pages on-demand, refreshing them periodically. These approaches still deliver fully-rendered HTML to search engines while maintaining the benefits of React for interactive features. However, they're less suitable for highly dynamic or personalized content where the page content changes based on user behavior or database queries.

Beyond rendering strategy, standard SEO practices still apply. Implement proper meta tags (title, description, canonical URLs) using libraries like react-helmet-async or Next.js built-in Head component. Create XML sitemaps and ensure your robots.txt file correctly allows crawling. Handle dynamic routing carefully to avoid duplicate content issues, and use structured data markup for rich snippets. Client-side redirects don't work for SEO—use server-side 301 redirects instead. Page speed matters significantly for ranking, so optimize images, implement lazy loading, and monitor Core Web Vitals. React's bundle size can impact performance, so code-split aggressively and remove unused dependencies.

When pitching to clients, be clear about the rendering approach and its SEO implications. Many agencies make the mistake of recommending client-side-only React without understanding the SEO costs, then scramble with workarounds later. Having honest conversations about architecture upfront prevents problems and protects your agency's reputation. If a client needs both rich interactivity and strong organic search visibility, Next.js is almost always the right answer.