Redis vs Memcached Comparison

// Redis — caching and pub/sub (Node.js ioredis)
import Redis from 'ioredis';
const redis = new Redis(process.env.REDIS_URL);

// Caching with TTL
async function getUserCached(userId: string) {
  const cached = await redis.get(\`user:\${userId}\`);
  if (cached) return JSON.parse(cached);
  const user = await db.users.findById(userId);
  await redis.setex(\`user:\${userId}\`, 3600, JSON.stringify(user));
  return user;
}

// Leaderboard with sorted set
await redis.zadd('leaderboard', 1500, 'ali');
await redis.zadd('leaderboard', 2300, 'ayse');
const top10 = await redis.zrevrange('leaderboard', 0, 9, 'WITHSCORES');

// Rate limiting
const key = \`rate:\${ip}\`;
const count = await redis.incr(key);
if (count === 1) await redis.expire(key, 60);
if (count > 100) throw new Error('Too many requests');

// Memcached — simple caching (Node.js memjs)
import Memcached from 'memjs';

const client = Memcached.Client.create(
  process.env.MEMCACHIER_SERVERS!,
  {
    username: process.env.MEMCACHIER_USERNAME,
    password: process.env.MEMCACHIER_PASSWORD
  }
);

// Data caching (TTL: 1 hour)
async function getPageCached(path: string) {
  const { value } = await client.get(path);
  if (value) return value.toString();

  const html = await renderPage(path);
  await client.set(path, html, { expires: 3600 });
  return html;
}

// Clear the cache
await client.delete('home-page');