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seo-lint-next

v0.2.2

Published

Build-time, App Router-aware SEO linter for Next.js.

Downloads

677

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

codingdoneraittcodingdoneraitt

Keywords

nextjsnextseoeslinteslint-pluginmetadataapp-router

Readme

seo-lint-next catches the SEO bugs that usually escape to production: missing titles, broken canonicals, unsafe metadataBase, bad OG tags, accidental noindex, sitemap gaps, invalid JSON-LD, heading skips, weak image alt text, broken locale metadata, bad App Router patterns, and crawl-blocking config.

Install

npm install --save-dev seo-lint-next

Requires Node.js 18.18+ and works with ESLint 8.57+ or 9.

ESLint

// eslint.config.mjs
import seoLint from 'seo-lint-next/eslint'

export default [...seoLint.configs.recommended]

CLI

npx seo-lint-next
npx seo-lint-next --dir src/app
npx seo-lint-next --format json
npx seo-lint-next --strict

Rule Set

| Rule | Default | Catches | | ---------------------------------------- | ------: | ---------------------------------------------------------------- | | no-missing-title | error | Missing, empty, duplicate, or weak dynamic titles | | no-missing-metadata-base | error | Missing, localhost, or non-HTTPS root metadataBase | | no-missing-description | warn | Missing, duplicate, too short, or too long descriptions | | no-missing-canonical | error | Missing canonicals and hardcoded dynamic-route canonicals | | no-missing-og-tags | warn | Missing Open Graph/Twitter tags | | no-broken-heading-hierarchy | warn | Missing/multiple H1s and skipped heading levels | | no-img-missing-alt | warn | Raw <img>, missing/generic alt text, layout-shifting images | | no-accidental-noindex | error | Public noindex, blanket robots blocks, risky X-Robots headers | | no-missing-sitemap | warn | Missing sitemap, relative URLs, missing robots sitemap reference | | no-invalid-json-ld | error | Invalid JSON-LD syntax, bad context, missing schema fields | | no-missing-lang-attribute | error | Missing or invalid <html lang> in App Router layouts | | no-missing-viewport | error | Broken viewport overrides and disabled user zoom | | no-use-client-on-page | warn | Top-level client pages and ignored metadata exports | | no-missing-hreflang | warn | Locale routes without alternates.languages | | no-generic-anchor-text | warn | Empty or generic link text | | no-missing-404-page | warn | Missing or weak app/not-found.tsx recovery pages | | no-missing-og-image-dimensions | warn | OG images without width, height, or alt text | | no-blocking-next-static | error | Robots rules blocking /_next/ rendering assets | | no-missing-breadcrumb-schema | warn | Deep pages without BreadcrumbList JSON-LD | | no-title-in-pages-head | error | next/head metadata patterns inside app/ | | no-dynamic-import-ssr-false-on-content | warn | dynamic(..., { ssr: false }) around likely content | | no-missing-next-font | warn | External Google Fonts instead of next/font | | no-redirect-chain-in-next-config | warn | Redirect chains and temporary redirects in next.config | | no-missing-article-dates | warn | Article pages missing freshness metadata | | no-missing-error-boundary-metadata | warn | Missing error boundaries or weak recovery links |

Configuration

import seoLint from 'seo-lint-next/eslint'

export default [
  ...seoLint.configs.recommended,
  {
    rules: {
      'seo-lint-next/no-missing-description': ['warn', { descriptionLength: { min: 120, max: 160 } }],
      'seo-lint-next/no-accidental-noindex': [
        'error',
        { privateRoutes: ['/admin', '/api', '/auth', '/private'] },
      ],
    },
  },
]

CI

- run: npm ci
- run: npm run check

The package has no production bundle impact. It statically inspects App Router source files, JSX, metadata exports, generateMetadata() returns, next.config.*, app/robots.ts, public/robots.txt, and app/sitemap.ts.