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React SPA to Next.js Migration for SEO, Indexing and Performance

Use this page when a React site is hard to index, key routes only come alive after hydration, and the migration needs to preserve URLs, metadata, and release momentum rather than becoming a blind rewrite.

Move a React SPA to Next.js before client‑rendered routes keep important pages out of search and start capping performance or delivery speed.

Typical symptoms

  • The current SPA depends too heavily on client‑side rendering for key content.
  • Search visibility or crawlability is weaker than the content deserves.
  • Build and routing requirements are growing beyond the existing setup.

Likely causes

  • Important content is only available after client‑side execution.
  • Routing, metadata, and rendering concerns are tightly coupled to the SPA shell.
  • The current stack makes content publishing or page generation awkward.

What I look at first

  • Quick check: compare the raw HTML and metadata on your highest‑value SPA routes with what only appears after hydration.
  • URL and metadata continuity between the existing SPA and the target Next.js build.
  • How data fetching, routing, and deployment need to change during migration.

How I help fix this

  • Plan the migration path and rendering model before code changes begin.
  • Define route, data, and SEO continuity so the move is staged safely.
  • Support implementation and debugging during the migration.

When to bring me in

  • Bring me in before the new rendering model and route strategy are locked in.
  • Bring me in when SEO, performance, and delivery risk all need to be managed in the same migration.

Related project experience

  1. Virgin Atlantic
    & Holidays

    Lead engineer on this massive replatforming project, unifying twelve disparate applications under a new headless architecture with React and Next.js.

    Screenshot of the Virgin Atlantic & Holidays website; part of John Kavanagh's development portfolio.

Supporting technical articles

  • Static Generation vs. Server-Side Rendering in Next.js

    20 April 2020

    Static generation and server-side rendering solve different problems in Next.js. This guide compares performance, freshness, and trade-offs.

  • Understanding File-System Routing in Next.js

    11 April 2018

    File-system routing in Next.js explained clearly, including the `pages` directory, nested routes, index files, and why routing feels simpler than custom setups.

  • Dynamic Routes in Next.js

    24 July 2019

    Dynamic routes in Next.js explained with `[slug]` pages, route params, nested segments, and why file-based dynamic routing simplifies content-driven sites.

Related services

  1. Parent hub

    Migrations to Next.js

    Choose the right Next.js migration path when an older front end, legacy platform, or hard‑to‑maintain site needs a cleaner architecture and safer migration plan.

  2. Capability

    Next.js Platform Consulting

    Bring in senior Next.js architecture support when a legacy platform, older front end, or hard‑to‑maintain site needs migration planning, platform rescue, and clearer delivery direction.

  3. Adjacent scenario

    WordPress to Next.js Migration

    Move a WordPress‑led front end to Next.js when speed, scale, and maintainability all need to improve without losing URLs, preview trust, or editorial continuity.

Show me what's not working

Send me the affected page or route, point me at the code if that helps, and tell me what you expected to happen versus what is happening now. If this connects to a Next.js migration, technical SEO drop, performance issue, launch, or platform move, include that context too. I'll come back with the clearest next step.

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