Technical SEO checklist for React and Next.js apps

Before writing more content, make sure Google can render, index and understand your site. In React/Next apps, most problems live right here.

Rendering and indexing

• Critical content in the initial HTML (SSR/SSG), not only after JS.
• Correct robots.txt and sitemap.xml, submitted in Search Console.
• One canonical URL per page, no duplicates from query strings.
• Correct hreflang on multilingual sites.

Structured data

• Organization and WebSite JSON-LD in the layout.
• Article and BreadcrumbList on content pages.
• FAQPage where it makes sense — eligible for a rich result.

Performance

• Core Web Vitals within target (see our other article).
• Optimized images with defined dimensions.
• JavaScript shipped on demand, not all at once.

This is exactly the ground we cover in an audit — prioritized by impact, delivered in 7 days.