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Returns the number of key arguments that exist. Note that if the same existing key is mentioned in the argument multiple times, it will be counted multiple times.


keysstring[]the keys to check the existence of.


TypeResolves withRejected when
Promise<number>On success, the promise resolves with the number of keys that exist from those specified as arguments.


import redis from 'k6/experimental/redis';
// Get the redis instance(s) address and password from the environment
const redis_addrs = __ENV.REDIS_ADDRS || '';
const redis_password = __ENV.REDIS_PASSWORD || '';
// Instantiate a new redis client
const redisClient = new redis.Client({
addrs: redis_addrs.split(',') || new Array('localhost:6379'), // in the form of 'host:port', separated by commas
password: redis_password,
export default function () {
.set('mykey', 'myvalue', 0)
.then((_) => redisClient.exists('mykey'))
.then((exists) => {
if (exists === false) {
throw new Error('mykey should exist');
return redisClient.get('mykey');
.then((value) => console.log(`set key 'mykey' to value: ${value}`))
.then(() => redisClient.del('mykey'));