DELEX - Upstash Documentation

Use DELEX to delete a string when a condition matches.

IFEQ deletes the key only when its current value equals the given one and IFNE only when it differs. IFDEQ and IFDNE do the same against a digest of the value, as returned by DIGEST, which avoids sending a large value over the wire just to compare it.

The comparison and the delete are one atomic step, which is what makes the command the correct way to release a lock or a claim: delete the key only if it still holds your token, so you never remove a lock that has expired and been taken by someone else. With no condition it simply deletes the key. The conditional forms require a string value, and a key of another type returns an error without being deleted.

Syntax#

DELEX <key> [IFEQ <value> | IFNE <value> | IFDEQ <digest> | IFDNE <digest>]

Arguments#

Argument	Required	Repeatable	Description
`key`	Yes	No	String key to delete.
`IFEQ value \| IFNE value`	No	No	Delete when the stored string is equal to or different from the supplied value.
`IFDEQ digest \| IFDNE digest`	No	No	Delete when the stored string digest is equal to or different from the supplied 16-character digest.

Important points#

Supply at most one condition. With no condition, DELEX behaves like deleting a single key.
Conditional forms accept string keys only. A non-string value returns an error and is not deleted.

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

DELEX lock:job-1 IFEQ worker-1

@upstash/redis

Note

This command is not supported yet in @upstash/redis.

upstash_redis

Note

This command is not supported yet in upstash_redis.

ioredis

import Redis from "ioredis";const redis = new Redis(process.env.REDIS_URL!);const result = await redis.call("DELEX", "lock:job-1", "IFEQ", "worker-1");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.delEx("lock:job-1", { condition: "IFEQ", matchValue: "worker-1" });console.log(result);

redis-py

import osimport redisclient = redis.from_url(os.environ["REDIS_URL"])result = client.execute_command("DELEX", "lock:job-1", "IFEQ", "worker-1")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.DelExArgs(context.Background(), "lock:job-1", redis.DelExArgs{Mode: "IFEQ", MatchValue: "worker-1"}).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.delex("lock:job-1", redis.clients.jedis.util.CompareCondition.valueEq("worker-1"));  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.del_ex("lock:job-1", redis::ValueComparison::ifeq("worker-1"))?;    println!("{result:?}");    Ok(())}