TanStack Query

Server-state cache

FreeLibraries & build toolingtanstack.com

What it is

A cache for data that lives on a server, currently v5. It handles fetching, caching, deduplication, background refetching, retries, pagination and optimistic updates behind a useQuery hook, and tracks loading and error states for you.

Why it earns a slot

The single highest-leverage library in this list. Without it you rewrite the same useEffect plus loading plus error plus stale-data bug in every component, and AI-generated fetch code is exactly where those bugs hide.

Know before you commit

It is not a client-state store — do not put form input or UI toggles in it. v5 renamed several options from v4, so older tutorials misfire.

Getting started

npm install @tanstack/react-query

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Pricing snapshot

Free · MIT

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Drop into your Lovable chat

Evaluate TanStack Query (https://tanstack.com/query) for this project, then use it only if it fits what we are already building.
Context: Server-state cache. A cache for data that lives on a server, currently v5. It handles fetching, caching, deduplication, background refetching, retries, pagination and optimistic updates behind a useQuery hook, and tracks loading and error states for you.
Reviewer notes (general, not written for this codebase): The single highest-leverage library in this list. Without it you rewrite the same useEffect plus loading plus error plus stale-data bug in every component, and AI-generated fetch code is exactly where those bugs hide.
Watch out for: It is not a client-state store — do not put form input or UI toggles in it. v5 renamed several options from v4, so older tutorials misfire.
Pricing: Free · MIT
Setup: npm install @tanstack/react-query
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

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