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


Returns the length of the list stored at key. If key does not exist, it is interpreted as an empty list and 0 is returned.


keystringkey holding the list to get the length of.


TypeResolves withRejected when
Promise<number>On success, the promise resolves with the length of the list at key.If the list does not exist, the promise is rejected with an error.


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 () {
.rpush('mylist', 'first')
.then((_) => redisClient.rpush('mylist', 'second'))
.then((_) => redisClient.rpush('mylist', 'third'))
.then((_) => redisClient.llen('mylist'))
.then((length) => {
if (length !== 3) {
throw new Error('llen operations should have returned 3');