Service · JavaScript SEO
JavaScript SEO so the content users see is the content Google indexes
JavaScript SEO is the work of making sure a site built on a framework like React, Vue, or Next.js is fully crawlable and indexable, not just usable in a browser. The failure mode is quiet: a page looks perfect to a visitor while Googlebot receives an empty shell. We find that gap and close it, usually by moving the important content into the initial HTML.
Google renders JavaScript. It does not render it for free, and it does not render it on a guarantee.
Googlebot fetches the HTML, then queues the page for rendering with a headless browser. On a small site you rarely notice the delay. On a large site with a tight render budget, pages can wait, and content that only exists after a client-side render can be missed or picked up late. Add a third-party script that times out, a hydration error, or content gated behind a click, and the picture gets worse.
The practical rule we work by: if it matters for search, it should be in the HTML that arrives before any JavaScript runs. Everything else is a bet on the render happening the way you hope.
The test that settles it
# 1. Raw HTML, before JS
curl -s https://example.com/product/123 | grep "<h1"
# 2. Compare with the rendered DOM in
# Search Console > URL Inspection > View crawled page
# If the <h1>, body copy, internal links, or
# canonical only appear in step 2, they depend
# on client-side rendering and are at risk.Rendering methods
How each rendering strategy looks to a crawler
There is no single correct answer. The right method depends on how often the content changes and how much it matters for search. Here is the trade-off in one table.
| Method | What Googlebot gets | SEO risk | Good fit for |
|---|---|---|---|
| Client-side rendering (CSR) | Near-empty HTML until JS runs and succeeds | High: content depends on a successful, timely render | Logged-in apps and dashboards, not public content |
| Server-side rendering (SSR) | Full HTML on request, hydrated in the browser | Low, if TTFB is controlled | Frequently changing content that needs to be indexable |
| Static generation (SSG) | Full HTML built ahead of time, served from the edge | Very low | Content that changes rarely: marketing, docs, articles |
| Incremental static regeneration (ISR) | Static HTML, rebuilt on a schedule or on demand | Very low | Large catalogues that change but not every second |
Scroll table horizontally →
How we work on it
From diagnosis to shipped fix
- 01
Render diagnosis
We compare raw and rendered HTML across your key templates and confirm what Googlebot actually receives, using URL Inspection and log evidence rather than assumptions.
- 02
Map content to rendering strategy
We decide, per template, whether it should be server-rendered, statically generated, or left client-side, based on how it changes and how much search weight it carries.
- 03
Spec or build the change
On frameworks we know well we open pull requests. Elsewhere we write specs your engineers can implement, with clear acceptance criteria.
- 04
Verify in the field
After deploy we re-inspect the rendered HTML, confirm the content is in the initial response, and watch index coverage for the affected templates.
FAQ
JavaScript SEO questions
Does Google render JavaScript?
Yes. Googlebot runs a modern rendering engine and will execute JavaScript to see the final page. The catch is that rendering is queued and resource-limited, so it can be delayed, and anything that depends on user interaction, times out, or fails silently may never make it into the index. Rendering happening is not the same as rendering happening reliably.
How do I know if JavaScript is hurting my SEO?
Compare the raw HTML from view-source with the rendered DOM, and check the rendered HTML in the URL Inspection tool. If primary content, internal links, or canonical tags only appear after JavaScript runs, that content is at risk. Missing pages in the index that render fine in a browser are the classic signal.
What is the fix for client-side rendering problems?
Move the content that matters for search into the initial server response, through server-side rendering, static generation, or hydration of pre-rendered HTML. The goal is that Googlebot sees your primary content and links without depending on a successful client-side render.
Can you fix this without a full rewrite?
Often, yes. Many stacks support rendering the important routes server-side or statically while leaving the rest of the app as it is. We identify which templates carry the SEO weight and focus the work there, rather than pushing a rewrite nobody has budget for.
Do you work in frameworks like Next.js directly?
Yes. For Next.js, Nuxt, and similar frameworks we can work in the repo, adjust rendering strategy per route, fix metadata and canonical handling, and open pull requests your team reviews. For less common or locked-down stacks we spec the changes for your engineers.
Related reading
Rendering problems rarely travel alone. As a technical SEO agency we usually find them tangled up with indexation and performance, and we fix the set together.
Start here
Pages that render for users but not for Google?
Send a URL that is missing from the index. We will tell you within a day whether rendering is the cause.