Generates CRC hashes for strings - for use by node redis clients to determine key slots.
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benchmark added old tag extraction from ioredis May 31, 2016
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test fix #3 Apr 25, 2018
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Redis Key Slot Calculator

A high performance redis cluster key slot calculator for node redis clients e.g. node_redis, ioredis and redis-clustr.

This also handles key tags such as somekey{actualTag}.


Install with NPM:

npm install cluster-key-slot --save


const calculateSlot = require('cluster-key-slot');
const calculateMultipleSlots = require('cluster-key-slot').generateMulti;

// ...

// a single slot number
const slot = calculateSlot('test:key:{butOnlyThis}redis');

// multiple keys - multi returns a single key slot number, returns -1 if any
// of the keys does not match the base slot number (base is defaulted to first keys slot)
// This is useful to quickly determine a singe slot for multi keys operations.
const slotForRedisMulti = calculateMultipleSlots([


OLD in these benchmarks refers to the ioredis crc calc and many of the other calculators that use Buffer.

NEW tags x 472,156 ops/sec ±1.80% (90 runs sampled)
OLD tags x 413,725 ops/sec ±1.37% (93 runs sampled)
NEW without tags x 1,287,795 ops/sec ±2.06% (89 runs sampled)
OLD without tags x 633,340 ops/sec ±0.87% (93 runs sampled)
NEW without tags singular x 4,824,560 ops/sec ±1.71% (93 runs sampled)
OLD without tags singular x 2,981,057 ops/sec ±0.22% (96 runs sampled)