express-cache-middleware

const express = require('express'); const ExpressCache = require('express-cache-middleware'); const cacheManager = require('cache-manager'); const app = express(); // Initialize cache-manager with a memory store (compatible with v2.x) const memoryCache = cacheManager.caching({ store: 'memory', max: 10000, ttl: 3600 // 1 hour TTL }); const cacheMiddleware = new ExpressCache(memoryCache, { // Optional: Customize cache key based on request URL and specific query params getCacheKey: (req) => { const url = new URL(req.url, `http://${req.headers.host}`); // Remove 'timestamp' query param from cache key to ensure consistent caching url.searchParams.delete('timestamp'); return url.toString(); } }); // Layer the caching in front of the routes to be cached cacheMiddleware.attach(app); // Attach routes to be cached. This example caches all GET requests. app.get('/data', (req, res) => { console.log('Fetching data...'); // Simulate an expensive operation or a database call setTimeout(() => { res.status(200).send(`Data from server at ${new Date().toISOString()}`); }, 500); }); app.get('/image', (req, res) => { console.log('Sending image...'); res.set('Content-Type', 'image/png'); // Simulate sending an image buffer res.send(Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a])); // A minimal PNG header }); const PORT = 3000; app.listen(PORT, () => { console.log(`Server listening on port ${PORT}`); console.log('Try visiting http://localhost:3000/data multiple times, then http://localhost:3000/data?timestamp=123'); });