What Is TanStack Query?
LibraryTanStack Query (formerly React Query) is a data-fetching and server-state library for React, Vue, Solid and Svelte. It handles caching, background refetching, pagination and request deduplication so applications do not have to hand-roll loading and error states — a standard choice in dashboards and SaaS front ends, hand-written or AI-assisted.
Detect TanStack Query on any website:
Why TanStack Query Matters
Libraries and third-party services are where a site's real behaviour lives: analytics, payments, auth, UI components and animation all arrive as scripts the browser can see. Knowing that TanStack Query is on a page tells you about its dependencies, its privacy footprint, and sometimes its build pipeline — and it helps you tell template-driven stacks from hand-assembled ones. We've fingerprinted TanStack Query on 18 live sites in our database, so the answers here are grounded in real scan data — not marketing copy.
Does TanStack Query Mean a Site Was Built With AI?
TanStack Query alone is not an AI signal.
A library is standard web tooling used by hand-coding developers and AI tools alike. It becomes weak supporting context only in combination with other evidence — for example a shadcn/ui + Supabase + Vite bundle that matches a known AI-builder export — and never counts as proof on its own.
How this feeds the score: builder fingerprints, bundle artifacts and AI-tool traces are weighed separately from stack context like frameworks, libraries and hosting. The full breakdown is on How scores work.
How Websites Using TanStack Query Work
- `useQuery` / `useMutation` hooks keyed by query keys with automatic cache invalidation
- Stale-while-revalidate caching, background refetch on focus and reconnect
- Devtools panel that injects a floating button in development builds
- Framework adapters for React, Vue, Solid, Svelte and Angular
Best Practices When Working With TanStack Query
Based on patterns in our scan dataset and the detection evidence tiers.
- →Start by running a TanStack Query detection scan on any URL you're evaluating — the 80+ signal engine returns a confidence score plus the exact markers it matched, which beats reading view-source by hand.
- →Cross-check the result against the full detection evidence in /how-scores-work — confidence tiers tell you whether a match is strong (headers + scripts) or circumstantial (a single HTML pattern).
How we detect TanStack Query — see our methodology: AI Influence Score calculation, evidence tiers, and fingerprint signal types.
How Our Detector Identifies TanStack Query
Our scanner analyzes multiple layers of a website's technical fingerprint to detect TanStack Query usage.
- Bundle references to @tanstack/react-query or react-query
- QueryClientProvider wrappers or the TanStack devtools element in the DOM
Websites Built With TanStack Query
Real sites detected by our scanner
What TanStack Query Sites Usually Run Alongside
Technologies detected on the same domains as TanStack Query in our most recent scans. Counts are unique domains, not page views.
Frequently Asked Questions About TanStack Query
What is TanStack Query?+
TanStack Query (formerly React Query) is a data-fetching and server-state library for React, Vue, Solid and Svelte. It handles caching, background refetching, pagination and request deduplication so applications do not have to hand-roll loading and error states — a standard choice in dashboards and SaaS front ends, hand-written or AI-assisted.
Does TanStack Query mean a website was built with AI?+
TanStack Query alone is not an AI signal. A library is standard web tooling used by hand-coding developers and AI tools alike. It becomes weak supporting context only in combination with other evidence — for example a shadcn/ui + Supabase + Vite bundle that matches a known AI-builder export — and never counts as proof on its own.
Why does TanStack Query matter?+
Libraries and third-party services are where a site's real behaviour lives: analytics, payments, auth, UI components and animation all arrive as scripts the browser can see. Knowing that TanStack Query is on a page tells you about its dependencies, its privacy footprint, and sometimes its build pipeline — and it helps you tell template-driven stacks from hand-assembled ones. We've fingerprinted TanStack Query on 18 live sites in our database, so the answers here are grounded in real scan data — not marketing copy.
How do we detect TanStack Query?+
Our scanner checks for these signals: Bundle references to @tanstack/react-query or react-query; QueryClientProvider wrappers or the TanStack devtools element in the DOM. Each match contributes to a confidence score, and the full evidence tiers are documented at /how-scores-work.
How many websites using TanStack Query are in the database?+
We've fingerprinted 18+ live sites built with TanStack Query across our scan dataset. The list refreshes as new scans come in.
What are the typical characteristics of a TanStack Query website?+
`useQuery` / `useMutation` hooks keyed by query keys with automatic cache invalidation. Stale-while-revalidate caching, background refetch on focus and reconnect. Devtools panel that injects a floating button in development builds. Framework adapters for React, Vue, Solid, Svelte and Angular
Related Tools & Technologies
Other libraries and services we detect
Ready to put TanStack Query detection to work?
You now know what TanStack Query is, why it matters, how to spot it, and where the detection signals come from. The next step is using that knowledge on a real URL — yours, a competitor's, or a prospect's.