The Ultimate Guide to Redis Caching in Node.js & Express (2025)
The Ultimate Guide to Redis Caching in Node.js & Express (2025)
Redis caching can instantly speed up your Node.js API responses — but only if you implement it the right way.
In this step-by-step 2025 guide, you’ll learn how to set up Redis caching inside an Express server, build a custom caching middleware, store GitHub API results, and apply expirations (TTL) to keep your data fresh.
You’ll watch the full caching flow in action: handling requests, avoiding unnecessary API calls, returning cached values instantly, and measuring real performance improvements.
By the end, you’ll know how to:
✅ Build a Redis caching middleware in Express
✅ Cache dynamic GitHub API responses
✅ Use Redis commands such as SET, EXPIRE, and TTL
✅ Clear the cache using FLUSHALL
✅ Apply expiration timers to auto-remove stale data
Perfect for backend developers, full-stack engineers, and anyone trying to make Node.js APIs dramatically faster.
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⏱️ Timestamps:
00:00 — Setting up Redis in a Node.js + Express server
00:34 — How the caching middleware checks for stored data
01:32 — Fetching GitHub repos and saving responses in Redis
03:40 — First-time vs. cached request speed comparison
04:54 — Using FLUSHALL to clear cached data
06:47 — Adding TTL expiration to cached key-value pairs
07:27 — Checking time-to-live with the TTL command
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