SWR
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What is SWR?
SWR is a React Hooks library for data fetching.
The name “SWR” is derived from stale-while-revalidate, a cache invalidation strategy popularized by HTTP RFC 5861. SWR first returns the data from cache (stale), then sends the request (revalidate), and finally comes with the up-to-date data again.
With just one hook, you can significantly simplify the data fetching logic in your project.
Free resources to learn SWR
More in stage 11: Testing
SWR: common questions
Can I learn SWR in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain SWR in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this SWR tutorial for beginners?
It is lesson 58 of 79 in the free React roadmap, in stage 11, Testing. If you are new to React, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.