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

Client.incrBy(key, increment)

Increments the number stored at key by increment. If the key does not exist, it is set to zero before performing the operation.


keystringthe key to increment
incrementnumberthe amount to increment by


TypeResolves withRejected when
Promise<number>On success, the promise resolves with the value of key after the increment.If the key contains a value of the wrong type, or contains a string that cannot be represented as an integer, 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 async function () {
await redisClient.set('mykey', 10, 0);
let value = await redisClient.incr('mykey');
value = await redisClient.incrBy('mykey', value);
value = await redisClient.decrBy('mykey', value);
value = await redisClient.decr('mykey');
if (value !== -1) {
throw new Error('mykey should have been -1');