SEO Checklist for Modern Websites 2026

Technical SEO checklist every new website should pass before launch. Structured data, speed, indexing, metadata.

Why this matters

Most “cheap” websites in 2026 ship without SEO optimization. That means after launch, the site doesn’t get indexed by Google or Yandex — which means no organic traffic without paid ads. This checklist is the bare minimum any modern site MUST cover.

1. Content rendered server-side

Open view-source: of your site. If you only see <div id="root"></div> — it’s a CSR-only React/Vue site. Search bots see the same: an empty page.

Solutions in 2026:

  • Astro for content sites and landings
  • Next.js for dynamic apps
  • Nuxt (Vue) for Vue-based stacks

The worst option is Create React App or Vite + React without an SSR wrapper. SEO barely works on those.

2. Single correct H1

Exactly one <h1> per page with the target keyword. Not two, not zero.

3. Per-page title and description

<title>Specific page title — Brand</title>
<meta name="description" content="..." />

Title 50–60 chars. Description 120–160. Unique on every page.

4. Canonical URL

<link rel="canonical" href="https://example.com/page" />

Mandatory on every page.

5. Open Graph + Twitter Card

For social sharing. Image 1200×630.

6. Structured data (JSON-LD)

Critical for rich results in 2026. Minimum:

  • Organization on the homepage
  • Service on service pages
  • FAQPage wherever there’s a FAQ
  • BreadcrumbList on inner pages
  • Article on blog posts

Validate via Schema.org Validator and Google Rich Results Test.

7. Core Web Vitals

Target Lighthouse 95+. Key metrics:

  • LCP < 2.5s — Largest Contentful Paint
  • CLS < 0.1 — no layout shift
  • INP < 200ms — interaction responsiveness

What usually breaks speed:

  • Huge unoptimized images (use WebP/AVIF)
  • Fonts without font-display: swap
  • Synchronous analytics (load async)
  • Heavy 3D in initial bundle (use lazy/idle loading)

8. Sitemap and robots.txt

Auto-generated sitemap including all indexable pages. Robots.txt with Disallow for admin/api routes and a Sitemap: reference.

9. Verification

Verify the site in Google Search Console and Yandex Webmaster via meta tag or HTML file. Without verification, you can’t see indexing stats and errors.

10. Hreflang for multilingual

<link rel="alternate" hreflang="en" href="https://example.com/" />
<link rel="alternate" hreflang="ru" href="https://example.com/ru/" />
<link rel="alternate" hreflang="x-default" href="https://example.com/" />

Final check before launch

Run the site through:

  1. PageSpeed Insights (mobile + desktop) → 90+
  2. Search Console → URL Inspection
  3. Schema Validator
  4. Screaming Frog for full crawl

If any score below 90 or shows errors — that’s tech debt that will throttle your search rankings.


If your developer hasn’t covered these post-launch — consider requesting an audit. I do free audits within 24 hours: drop a request here.

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