keyv
Simple key-value storage with support for multiple backends
eventstore
Node-eventstore is a node.js module for multiple databases. It can be very useful as eventstore if you work with (d)ddd, cqrs, eventsourcing, commands and events, etc.
ioredis-mock
This library emulates ioredis by performing all operations in-memory.
cluster-key-slot
Generates CRC hashes for strings - for use by node redis clients to determine key slots.