React SEO Audit
Scanverra loads your React app the way a browser does and checks what's actually in the page before and after JavaScript runs - because for a client-rendered SPA, that gap is where most SEO problems live.
What we check for React
Five checks specific to how single-page apps render and ship content.
Content visible before JavaScript runs
Whether the initial HTML response is an empty div#root and a script tag, or has real content that a crawler without a JS engine can still read.
Bundle size and code splitting
A single large JavaScript bundle shipped on every route versus route-based splitting - unnecessarily heavy first-load JS delays the point where the page becomes interactive.
Meta tags that only update client-side
Title and description set via document.title or a client-side head manager after mount are invisible to anything that doesn't execute your JavaScript first.
Console errors and error boundaries
Unhandled render errors that take down an entire view instead of being caught and contained by a boundary around the section that failed.
Layout stability on client-side navigation
Route changes that swap content without reserving space for it, causing a layout shift after the page already looked settled.
How it works
Three steps from URL to SPA-specific fixes.
Paste your app's URL
Any public React app - a Vite build, Create React App, or a hand-rolled setup all work the same way.
We compare raw HTML to the rendered page
The initial response is checked against what's on screen after React mounts, which is exactly where SPA-specific SEO problems live.
Get SPA-specific fixes
Suggestions written for a client-rendered app - not generic advice that assumes a server is doing the rendering for you.
Frequently asked questions
Yes. The audit loads the page in a real browser environment and lets your JavaScript run before scoring it, the same way a visitor would experience it - it doesn't require server rendering to work.
If nothing meaningful is present in the HTML before JavaScript executes, that shows up as a content-visibility and SEO issue - not because an empty root div is inherently wrong, but because anything that can't or won't run your JS sees nothing there.
It detects React itself through a wide set of signals - the id="root" mount point, known bundle filename patterns, and dev-tooling hooks - regardless of which build tool produced them. It doesn't report a specific toolchain label in your results.
It runs a full browser render, not a static HTML fetch, so it sees your fully mounted and hydrated page - then separately checks what existed before that JavaScript ran.
Yes. Console errors are part of the Best Practices score, and an uncaught render error in a component without an error boundary is one of the more common ways they show up.
Other technology audits
Find out what's missing before your JS runs
Bundle weight, meta tags, error boundaries, and layout stability - scored the way a crawler actually sees your app.
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