bun-redis

Install ioredis with bun add ioredis, then create a client with new Redis() for defaults, an options object with host, port, password, and db, or a connection string like redis://:password@localhost:6379/0. TLS is enabled by passing a tls option.

Use ioredis for self-hosted Redis servers with full command support including blocking operations and pub/sub. Use @upstash/redis for serverless or edge deployments where connections are short-lived and accessed over a REST API with a URL and token.

Use INCR on a key and set EXPIRE on the first increment to create a fixed-window counter. If the count exceeds your limit within the window, reject the request. The pattern requires only two Redis commands per check.

Yes, ioredis supports pub/sub by creating separate subscriber and publisher connections. The subscriber uses subscribe() and listens for message events, while the publisher calls publish(). Pattern subscriptions use psubscribe().

ECONNREFUSED means the Redis server is not running or unreachable at the configured host and port. NOAUTH means the server requires a password that was not provided in the client options or connection string.

Use multi()/exec() transactions when commands must execute atomically as a unit. Use pipelines when you only need to batch commands for fewer round trips and better performance, since pipelines provide no atomicity guarantees.