HELLO

Argument	Required	Repeatable	Description
`<protover> [AUTH <username> <password>] [SETNAME <clientname>]`	No	No	Protocol version to switch to, optionally with credentials and a connection name.

Argument

Required

Repeatable

Description

<protover> [AUTH <username> <password>] [SETNAME <clientname>]

Protocol version to switch to, optionally with credentials and a connection 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	Flat array of alternating keys and values
RESP3	Map

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

HELLO

ioredis

import Redis from "ioredis";

const redis = new Redis(process.env.REDIS_URL!);
const result = await redis.hello();
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.hello();
console.log(result);

redis-py

import os
import redis

client = redis.from_url(os.environ["REDIS_URL"])
result = client.hello()
print(result)

go-redis

package main

import (
    "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.Do(context.Background(), "HELLO").Result()
    if err != nil {
        panic(err)
    }
    fmt.Println(result)
}

jedis

import java.net.URI;
import java.nio.charset.StandardCharsets;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.commands.ProtocolCommand;

ProtocolCommand command = () -> "HELLO".getBytes(StandardCharsets.UTF_8);
try (Jedis jedis = new Jedis(new URI(System.getenv("REDIS_URL")))) {
  Object result = jedis.sendCommand(command);
  System.out.println(result);
}

redis-rs

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 mut command = redis::cmd("HELLO");

    let result: redis::Value = command.query(&mut connection)?;
    println!("{result:?}");
    Ok(())
}

Redis

Command Reference

Syntax

Arguments

Important points

Response

Examples

​Syntax

​Arguments

​Important points

​Response

​Examples

Syntax

Arguments

Important points

Response

Examples