Nextjs SEO

Next.js SEO Optimization

Comprehensive SEO guide for Next.js App Router applications.

Start with evidence and useful content

Read the installed Next.js version and relevant node_modules/next/dist/docs/ guides before changing framework code; use current official docs when local docs are unavailable. Use Vercel MCP documentation search for platform behavior when available, but check retrieved examples against the installed framework. Do not copy a legacy cache API from a search snippet into a newer app.

• Solve the reader's task first. A short useful page does not need padding. Give the H1, subtitle and section headings distinct jobs; do not repeat the same phrase in each for SEO. Keep UI copy concise, concrete and useful.
• Do not add generic introductions, keyword blocks, decorative badges, a FAQ or TL;DR just to make a page look optimized. Add content only when it answers a real question. Preserve necessary explanations and disclosures.
• Create team, location or category pages only when each offers distinct, maintainable value. A swapped name/logo and duplicate list is insufficient.
• Describe seasons, availability and update times from current data. Do not leave pre-launch copy on an active service or change timestamps for freshness.
• Separate evidence: a Search Console performance export shows queries and traffic, not indexing status, Google's canonical choice or CWV. Use the relevant report or URL Inspection; mark unavailable checks as unverified.
• Report findings and verification before predicting impact. No ranking, indexing, rich-result or AI-citation guarantees.

Quick SEO Audit

Run this checklist for any Next.js project:

1. Check robots.txt: curl https://your-site.com/robots.txt
2. Check sitemap: curl https://your-site.com/sitemap.xml
3. Check metadata: View page source, search for <title> and <meta name="description">
4. Check JSON-LD: View page source, search for application/ld+json
5. Check Core Web Vitals: Use PageSpeed Insights (pagespeed.web.dev) and the Search Console CWV report for field data — Lighthouse is lab-only and can't measure INP

Essential Files

app/layout.tsx - Root Metadata

import type { Metadata, Viewport } from 'next';

// Viewport must be a separate export — `themeColor`, `colorScheme`, and
// `viewport` inside the `metadata` object are deprecated (since v14: still
// emitted with a warning today, not guaranteed to stay).
export const viewport: Viewport = {
  width: 'device-width',
  initialScale: 1,
  maximumScale: 5,
  userScalable: true,
  themeColor: [
    { media: '(prefers-color-scheme: light)', color: '#ffffff' },
    { media: '(prefers-color-scheme: dark)', color: '#0a0a0a' },
  ],
};

export const metadata: Metadata = {
  metadataBase: new URL('https://your-site.com'),
  title: {
    default: 'Site Title - Main Keyword',
    template: '%s | Site Name',
  },
  // ~150-160 chars is a guideline, not a limit — Google truncates per device/query
  description: 'Compelling description with target keywords',
  // No `keywords` field: Google ignores the keywords meta tag entirely
  openGraph: {
    type: 'website',
    locale: 'en_US',
    url: 'https://your-site.com',
    siteName: 'Site Name',
    title: 'Site Title',
    description: 'Description for social sharing',
    images: [{ url: '/og-image.png', width: 1200, height: 630, alt: 'Site preview' }],
  },
  twitter: {
    card: 'summary_large_image',
    title: 'Site Title',
    description: 'Description for Twitter',
    images: ['/og-image.png'],
  },
  // Set alternates.canonical per page; a root '/' would be inherited by children.
  robots: {
    index: true,
    follow: true,
  },
};

app/sitemap.ts - Dynamic Sitemap

import type { MetadataRoute } from 'next';

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const baseUrl = 'https://your-site.com';
  const posts = await getPosts(); // your CMS/DB

  return [
    {
      url: baseUrl,
      images: [`${baseUrl}/og-image.png`], // Image Sitemap entry
    },
    { url: `${baseUrl}/about` },
    ...posts.map((post) => ({
      url: `${baseUrl}/blog/${post.slug}`,
      lastModified: post.updatedAt, // real content timestamp
    })),
  ];
}

lastModified must reflect the content's actual last change (CMS updatedAt, file mtime, git commit date) — Google uses lastmod only when it's consistently accurate, and new Date() on every build marks everything "just changed", which teaches Google to ignore it. Skip changeFrequency and priority: Google ignores both.

app/robots.ts - Robots Configuration

import type { MetadataRoute } from 'next';

export default function robots(): MetadataRoute.Robots {
  const baseUrl = 'https://your-site.com';

  return {
    rules: [
      {
        userAgent: '*',
        allow: '/',
        disallow: ['/api/', '/admin/'],
        // Do NOT disallow /_next/ — crawlers need render-critical CSS/JS
        // Do NOT add bot-specific rules (Googlebot, Bingbot) unless overriding wildcard —
        // and if you do, repeat all disallows: named groups don't inherit `*` rules
        // (RFC 9309 §2.2.1; Google never merges a specific group with `*`)
      },
    ],
    sitemap: `${baseUrl}/sitemap.xml`,
  };
}

host was omitted intentionally — it's a non-standard directive Google ignores. Use canonical URLs / 301s to declare the preferred host instead. See references/sitemap-robots.md.

app/manifest.ts - Web App Manifest

Same MetadataRoute family as sitemap/robots, placed at the root of app/. Not an SEO requirement — a PWA-completeness nicety with no ranking effect; skip it unless the site is (or may become) a PWA. Full example in references/metadata-api.md.

OG / Twitter Images

Three ways to set social images — prefer the file conventions over hand-syncing URLs in the metadata object:

1. External URL in metadata (the openGraph.images / twitter.images examples above) — fine for externally hosted images.
2. Static file convention (recommended default): drop opengraph-image.(png|jpg|gif) and/or twitter-image.* into a route segment (app/opengraph-image.png for the root, app/blog/opengraph-image.png for /blog). Next.js auto-emits og:image/twitter:image + :type/:width/:height. A deeper, more specific image overrides one above it. Add alt text with a sibling opengraph-image.alt.txt. Build fails if the file exceeds 8 MB (OG) / 5 MB (Twitter).
3. Dynamic generation with `ImageResponse` (per-page/per-post images): an opengraph-image.tsx in the route segment exporting alt, size, contentType and a default Image({ params }) (params is a Promise in v16) that returns new ImageResponse(<jsx/>, { ...size }). Renders via Satori — flexbox only, no `display: grid`; statically optimized at build time unless it reads request-time data. Full example, fonts, generateImageMetadata and the favicon/icon.tsx/apple-icon conventions: references/metadata-api.md.

Key Principles

Cache Components & SEO

With cacheComponents: true, use "use cache" for data/components that can be shared and whose freshness requirements permit caching. Static content needs no extra cache directive merely for SEO:

// app/(home)/sections/hero-section.tsx
import { cacheLife, cacheTag } from "next/cache";

export async function HeroSection() {
  "use cache";
  cacheLife("hours");   // SEO content that changes a few times/day; see profiles below
  cacheTag("hero");     // Invalidate via updateTag("hero") in a Server Action

  const data = await fetchData();
  return <div>{/* SEO-visible content */}</div>;
}

Choose cacheLife from the product's freshness requirements and the installed