Technical SEO Checklist for Next.js Websites in 2025
Why Technical SEO Matters More Than Ever
Google's ranking algorithm increasingly favors technically sound websites. Core Web Vitals are now a confirmed ranking signal, and with the rise of AI search, structured data and semantic HTML have become critical for visibility. Next.js provides excellent SEO foundations out of the box, but you still need to configure them correctly.
Core Web Vitals Optimization
LCP (Largest Contentful Paint): Use Next.js Image component with priority for above-the-fold images. Implement font preloading with next/font. Minimize render-blocking CSS. CLS (Cumulative Layout Shift): Always specify width/height for images and embeds. Use CSS aspect-ratio. Avoid dynamic content that pushes layout. INP (Interaction to Next Paint): Use React Server Components to reduce client-side JavaScript. Implement code splitting with dynamic imports.
Structured Data & Rich Results
Implement JSON-LD structured data for: Organization schema on your homepage, Article schema on blog posts, BreadcrumbList for navigation hierarchy, FAQ schema where applicable. Next.js makes this easy with the metadata API and generateMetadata function for dynamic pages.
International SEO for Bilingual Sites
For Vietnamese/English bilingual sites: Use hreflang tags to tell Google about language variants. Implement proper URL structure (/en/about vs /vi/about). Generate separate sitemaps per language. Ensure translated content is high-quality and not machine-translated.
Need Help?
EFE Technology specializes in building SEO-optimized Next.js websites. Every project includes our comprehensive technical SEO audit and implementation. Contact us for a free SEO assessment of your current website.
