SADD - Upstash Documentation

Use SADD to add one or more members to a set, creating it when the key does not exist.

A set holds unique, unordered members, so adding a member that is already there changes nothing, and the reply counts only the members that were actually new. That count is what makes the command a cheap deduplicator: a reply of 1 means this caller was the first to see the value, which is enough to decide whether to process an event or ignore it as a repeat.

Syntax#

SADD <key> <member> [<member> ...]

Arguments#

Argument	Required	Repeatable	Description
`<key>`	Yes	No	Redis key targeted by the command.
`<member>`	Yes	Yes	Member name.

Response#

The reply reports the result of the operation. Error replies have the same shape in RESP2 and RESP3 and are surfaced as exceptions by the SDKs below.

Protocol	Reply
RESP2	Integer
RESP3	Integer

Note

Client libraries often decode bulk strings, maps, sets, and numeric strings into language-native values. The table describes the Redis wire reply.

Examples#

TCP examples use the TLS REDIS_URL from the Upstash console. REST examples use UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN.

Redis CLI

SADD my-key member

@upstash/redis

import { Redis } from "@upstash/redis";const redis = Redis.fromEnv();// 3await redis.sadd("key", "a", "b", "c");// 0await redis.sadd("key", "a", "b");

upstash_redis

from upstash_redis import Redisredis = Redis.from_env()result = redis.sadd("my-key", "member")print(result)

ioredis

import Redis from "ioredis";const redis = new Redis(process.env.REDIS_URL!);const result = await redis.sadd("my-key", "member");console.log(result);

node-redis

import { createClient } from "redis";const client = await createClient({ url: process.env.REDIS_URL })  .on("error", console.error)  .connect();const result = await client.sAdd("my-key", "member");console.log(result);

redis-py

import osimport redisclient = redis.from_url(os.environ["REDIS_URL"])result = client.sadd("my-key", "member")print(result)

go-redis

package mainimport (    "context"    "fmt"    "os"    "github.com/redis/go-redis/v9")func main() {    opts, err := redis.ParseURL(os.Getenv("REDIS_URL"))    if err != nil {        panic(err)    }    client := redis.NewClient(opts)    result, err := client.SAdd(context.Background(), "my-key", "member").Result()    if err != nil {        panic(err)    }    fmt.Println(result)}

jedis

import java.net.URI;import redis.clients.jedis.Jedis;try (Jedis jedis = new Jedis(new URI(System.getenv("REDIS_URL")))) {  Object result = jedis.sadd("my-key", "member");  System.out.println(result);}

redis-rs

use redis::TypedCommands;fn main() -> redis::RedisResult<()> {    let url = std::env::var("REDIS_URL").expect("REDIS_URL is not set");    let client = redis::Client::open(url)?;    let mut connection = client.get_connection()?;    let result = connection.sadd("my-key", "member")?;    println!("{result:?}");    Ok(())}