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The Next.js SEO Stack: Metadata, Schema, and Performance

A complete technical blueprint for building SEO into your Next.js application from day one — metadata API, structured data, sitemap generation, and Core Web Vitals optimisation.

April 28, 2025·14 min read·Scalentic Digital

Why Next.js Is the Right Foundation for SEO

Next.js is not just a React framework — it is the best production infrastructure available for SEO-critical applications. Server-side rendering, static generation, streaming, edge deployment, and image optimisation are all first-class citizens. When configured correctly, a Next.js application can hit 95+ Lighthouse scores on every route and give Google everything it needs to crawl, index, and rank your content.

This guide covers the full technical SEO stack for Next.js App Router projects.

Metadata API

The App Router's Metadata API replaces the old next/head approach with a type-safe, co-located system.

Static metadata (page-level):

// app/services/seo/page.tsx

export const metadata: Metadata = {

title: 'SEO Strategy Services',

description: 'Technical SEO and organic growth systems.',

openGraph: {

title: 'SEO Strategy Services',

description: 'Technical SEO and organic growth systems.',

type: 'website',

},

};

Dynamic metadata (for blog posts, product pages):

export async function generateMetadata({ params }: Props): Promise {

const post = await getPost(params.slug);

return {

title: post.title,

description: post.excerpt,

};

}

Title templates prevent you from hardcoding the site name on every page:

// app/layout.tsx

export const metadata: Metadata = {

title: {

default: 'Scalentic Digital',

template: '%s | Scalentic Digital',

},

};

Structured Data (Schema.org)

Structured data enables rich results in Google Search — FAQ accordions, article bylines, breadcrumbs, review stars. It doesn't directly improve rankings, but it dramatically improves click-through rate, which indirectly does.

The cleanest implementation in Next.js is a server component that outputs a