> ## Documentation Index
> Fetch the complete documentation index at: https://upstash-redis-1-18.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ARMSET

> Set values at several array indexes.

Use `ARMSET` to write several index-value pairs into an array in one atomic call.

Unlike [`ARSET`](/redis/commands/array/arset), which fills a contiguous run from a starting index, `ARMSET` takes an explicit index for every value, so scattered slots can be updated together without a round trip each. The reply counts the slots that were newly occupied; pairs that overwrote an existing value contribute nothing to it.

If the same index appears more than once in one call, the last value given for it wins.

See the [array command overview](/redis/commands/array/overview) for the data model these commands share.

## Syntax

```redis theme={null}
ARMSET <key> <index> <value> [<index> <value> ...]
```

## Arguments

| Argument          | Required | Repeatable | Description                                                                    |
| ----------------- | -------- | ---------- | ------------------------------------------------------------------------------ |
| `<key>`           | Yes      | No         | Array key targeted by the command.                                             |
| `<index> <value>` | Yes      | Yes        | Index and the value to store in it. Repeat to write several slots in one call. |

## Important points

* The number of arguments after the key must be even; an odd count returns a wrong number of arguments error.
* The reply counts newly occupied slots only. Overwriting an existing value contributes `0`.

## 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.
</Note>

## Examples

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

<AccordionGroup>
  <Accordion title="Redis CLI" icon="terminal">
    ```bash theme={null}
    ARMSET my-array 0 hello 5 world
    ```
  </Accordion>

  <Accordion title="@upstash/redis" icon="node-js" iconType="brands">
    <Note>
      This command is not supported yet in `@upstash/redis`.
    </Note>
  </Accordion>

  <Accordion title="upstash_redis" icon="python" iconType="brands">
    <Note>
      This command is not supported yet in `upstash_redis`.
    </Note>
  </Accordion>

  <Accordion title="ioredis" icon="node-js" iconType="brands">
    ```ts theme={null}
    import Redis from "ioredis";

    const redis = new Redis(process.env.REDIS_URL!);
    const result = await redis.armset("my-array", 0, "hello", 5, "world");
    console.log(result);
    ```
  </Accordion>

  <Accordion title="node-redis" icon="node-js" iconType="brands">
    ```ts theme={null}
    import { createClient } from "redis";

    const client = await createClient({ url: process.env.REDIS_URL })
      .on("error", console.error)
      .connect();
    const result = await client.arMSet("my-array", { 0: "hello", 5: "world" });
    console.log(result);
    ```
  </Accordion>

  <Accordion title="redis-py" icon="python" iconType="brands">
    ```python theme={null}
    import os
    import redis

    client = redis.from_url(os.environ["REDIS_URL"])
    result = client.armset("my-array", {0: "hello", 5: "world"})
    print(result)
    ```
  </Accordion>

  <Accordion title="go-redis" icon="golang" iconType="brands">
    ```go theme={null}
    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.ARMSet(context.Background(), "my-array", redis.AREntry{Index: 0, Value: "hello"}, redis.AREntry{Index: 5, Value: "world"}).Result()
        if err != nil {
            panic(err)
        }
        fmt.Println(result)
    }
    ```
  </Accordion>

  <Accordion title="jedis" icon="java" iconType="brands">
    ```java theme={null}
    import java.net.URI;
    import java.util.Map;

    import redis.clients.jedis.Jedis;

    try (Jedis jedis = new Jedis(new URI(System.getenv("REDIS_URL")))) {
      Object result = jedis.armset("my-array", Map.of(0L, "hello", 5L, "world"));
      System.out.println(result);
    }
    ```
  </Accordion>

  <Accordion title="redis-rs" icon="rust" iconType="brands">
    ```rust theme={null}
    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("ARMSET");
        command.arg("my-array");
        command.arg("0");
        command.arg("hello");
        command.arg("5");
        command.arg("world");
        let result: redis::Value = command.query(&mut connection)?;
        println!("{result:?}");
        Ok(())
    }
    ```
  </Accordion>
</AccordionGroup>