Redis

What is Redis?

Redis is an ultra-fast, open-source in-memory datastore that works as a cache, message broker and database. By storing data in memory instead of on disk, Redis delivers response times under a millisecond. Redis is used by Twitter, GitHub, Snapchat and millions of other applications.

Why Redis is useful

Speed is crucial for a good user experience. Redis accelerates your application in multiple ways:

• Sub-millisecond latency: Data straight from memory, hundreds of times faster than disk
• Versatile data structures: Strings, hashes, lists, sets, sorted sets and more
• Pub/Sub messaging: Real-time communication between services and applications
• Session storage: Fast and reliable storage of user sessions

Time savings with Redis

Redis drastically reduces the load on your database and speeds up your application. Frequently used queries are cached instead of recalculated every time.

Hidden features that often go unused

Many teams use Redis only as a simple cache, but it can do much more:

• Rate Limiting: Limit API calls per user with atomic counters.
• Leaderboards: Sorted sets for real-time rankings and scoreboards.
• Geospatial: Search locations within a radius — ideal for proximity-based apps.
• Lua Scripting: Execute complex operations atomically on the server.
• RedisJSON: Store JSON documents and query them directly in Redis.
• RediSearch: Full-text search and secondary indexes on top of Redis.

Integrations with other tools

Redis integrates with many other tools and services:

• Node.js & Python: Popular Redis clients available for all major languages.
• Kubernetes: Redis Operator for automated deployment as sidecar or cluster.
• Exact Online & Teamleader: Use Redis as a cache layer for API integrations.