HEXISTS - Upstash Documentation

Use HEXISTS to check whether a field is present in a hash.

The reply is 1 when the field exists and 0 when either the field or the key is missing. Since the value is never transferred, this is the cheap way to test for presence, and it is also how you tell a missing field apart from a field whose value happens to be empty, which HGET cannot do.

Syntax#

HEXISTS <key> <field>

Arguments#

Argument	Required	Repeatable	Description
`<key>`	Yes	No	Redis key targeted by the command.
`<field>`	Yes	No	Hash field 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: `1` if the field exists, `0` otherwise
RESP3	Integer: `1` if the field exists, `0` otherwise

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

HEXISTS my-key field

@upstash/redis

import { Redis } from "@upstash/redis";const redis = Redis.fromEnv();await redis.hset("key", "field", "value");const exists = await redis.hexists("key", "field");console.log(exists); // 1

upstash_redis

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

ioredis

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

redis-py

import osimport redisclient = redis.from_url(os.environ["REDIS_URL"])result = client.hexists("my-key", "field")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.HExists(context.Background(), "my-key", "field").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.hexists("my-key", "field");  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.hexists("my-key", "field")?;    println!("{result:?}");    Ok(())}