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⚠️ This is the archived documentation for k6 v0.46. Go to the latest version.


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 async function () {
let exists = await redisClient.exists('mykey');
if (exists === true) {
throw new Error('mykey should not exist');
await redisClient.set('mykey', 'myvalue', 0);
exists = await redisClient.exists('mykey');
if (exists === false) {
throw new Error('mykey should exist');
await redisClient.del('mykey');