SWR

Data-fetching hooks

FreeLibraries & build toolingswr.vercel.app

What it is

Vercel's data-fetching hook library, v2, built on stale-while-revalidate: show cached data instantly, refetch in the background. Much smaller and simpler than TanStack Query, with revalidation on focus and reconnect plus pagination and mutation helpers.

Why it earns a slot

A lighter alternative when you want caching and revalidation but not TanStack Query's full surface. Common in Next.js codebases, so you will meet it in inherited or AI-generated Vercel-flavoured code.

Know before you commit

Thinner feature set: weaker devtools, less capable mutation and invalidation. Most greenfield projects pick TanStack Query instead.

Getting started

npm install swr

Field notes

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Pricing snapshot

Free · MIT

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Drop into your Lovable chat

Evaluate SWR (https://swr.vercel.app) for this project, then use it only if it fits what we are already building.
Context: Data-fetching hooks. Vercel's data-fetching hook library, v2, built on stale-while-revalidate: show cached data instantly, refetch in the background. Much smaller and simpler than TanStack Query, with revalidation on focus and reconnect plus pagination and mutation helpers.
Reviewer notes (general, not written for this codebase): A lighter alternative when you want caching and revalidation but not TanStack Query's full surface. Common in Next.js codebases, so you will meet it in inherited or AI-generated Vercel-flavoured code.
Watch out for: Thinner feature set: weaker devtools, less capable mutation and invalidation. Most greenfield projects pick TanStack Query instead.
Pricing: Free · MIT
Setup: npm install swr
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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