Redis
The most widely used in-memory data store. Redis powers caching, session storage, pub/sub messaging, rate limiting, leaderboards, and job queues. Blazing fast (sub-millisecond) and incredibly versatile.
Why Redis?
You need a high-performance cache to reduce database load
You need session storage, rate limiting, or pub/sub messaging
You're building a job queue or real-time leaderboard
Signal Breakdown
What drives the Trust Score
Download Trend
Last 12 months
Tradeoffs & Caveats
Know before you commitYou need durable primary storage — Redis is best as a cache or secondary store
Memory cost is a concern at very large data sizes
Pricing
Free tier & paid plans
Open-source self-host free · Redis Cloud: 30MB free
$7/mo Essentials (250MB)
Upstash: $0.2/100K commands (serverless)
Often Used Together
Complementary tools that pair well with Redis
Learning Resources
Docs, videos, tutorials, and courses
Get Started
Repository and installation options
View on GitHub
github.com/redis/redis
brew install redisdocker run -p 6379:6379 redisQuick Start
Copy and adapt to get going fast
import { createClient } from 'redis';
const client = createClient({ url: process.env.REDIS_URL });
await client.connect();
// Cache a database result for 1 hour
await client.set('user:123', JSON.stringify(userData), { EX: 3600 });
const cached = await client.get('user:123');
// Rate limiting
const requests = await client.incr(`rate:${userId}`);
await client.expire(`rate:${userId}`, 60);
if (requests > 100) throw new Error('Rate limit exceeded');Code Examples
Common usage patterns
Session store
Store Express sessions in Redis
import session from 'express-session';
import RedisStore from 'connect-redis';
import { createClient } from 'redis';
const redisClient = createClient({ url: process.env.REDIS_URL });
await redisClient.connect();
app.use(session({
store: new RedisStore({ client: redisClient }),
secret: process.env.SESSION_SECRET!,
resave: false,
saveUninitialized: false,
cookie: { secure: true, maxAge: 86400000 },
}));Pub/Sub messaging
Broadcast messages between services with Redis pub/sub
import { createClient } from 'redis';
const publisher = createClient({ url: process.env.REDIS_URL });
const subscriber = publisher.duplicate();
await Promise.all([publisher.connect(), subscriber.connect()]);
// Subscribe
await subscriber.subscribe('notifications', (message) => {
console.log('Received:', JSON.parse(message));
});
// Publish from another service
await publisher.publish('notifications', JSON.stringify({ type: 'user.signup', userId: 42 }));Sorted set leaderboard
Implement a real-time leaderboard with sorted sets
// Add score
await client.zAdd('leaderboard', [{ score: 1500, value: 'user:42' }]);
// Increment score
await client.zIncrBy('leaderboard', 100, 'user:42');
// Top 10 players
const top10 = await client.zRangeWithScores('leaderboard', 0, 9, { REV: true });
// Player rank
const rank = await client.zRevRank('leaderboard', 'user:42');Community Notes
Real experiences from developers who've used this tool