> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# JSON.ARRTRIM

> Trim JSON array to range.

Use `JSON.ARRTRIM` to keep only a range of elements in the arrays a path selects and discard the rest.

Both `start` and `stop` are inclusive indexes and may be negative to count from the end of the array. Indexes outside the array are clamped, and a range that selects nothing leaves an empty array. The reply is the new length of each array the path matched.

It is the JSON counterpart of [`LTRIM`](/docs/redis/commands/list/ltrim): combine it with [`JSON.ARRAPPEND`](/docs/redis/commands/json/json-arrappend) to keep a capped list, such as the last N events, inside a document.

## Syntax

```redis theme={"system"}
JSON.ARRTRIM <key> <path> <start> <stop>
```

## Arguments

| Argument | Required | Repeatable | Description                    |
| -------- | -------- | ---------- | ------------------------------ |
| `key`    | Yes      | No         | JSON document key.             |
| `path`   | Yes      | No         | Path selecting arrays.         |
| `start`  | Yes      | No         | Inclusive first index to keep. |
| `stop`   | Yes      | No         | Inclusive last index to keep.  |

## Important points

* Raw TCP examples pass JSON values as valid JSON text. Typed Upstash SDK helpers serialize native objects and values for you.
* Paths beginning with `$` use JSONPath and can match multiple values, so many JSON commands return an array of per-match results.

## 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    | Array of integer lengths or null values, one per matched path |
| RESP3    | Array of integer lengths or null values, one per matched path |

<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={"system"}
    JSON.ARRTRIM profile $.tags 0 9
    ```
  </Accordion>

  <Accordion title="@upstash/redis" icon="node-js" iconType="brands">
    ```ts theme={"system"}
    import { Redis } from "@upstash/redis";

    const redis = Redis.fromEnv();

    const length = await redis.json.arrtrim("key", "$.path.to.array", 2, 10);
    ```
  </Accordion>

  <Accordion title="upstash_redis" icon="python" iconType="brands">
    ```python theme={"system"}
    from upstash_redis import Redis

    redis = Redis.from_env()
    result = redis.json().arrtrim("profile", "$.tags", 0, 9)
    print(result)
    ```
  </Accordion>

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

    const redis = new Redis(process.env.REDIS_URL!);
    const result = await redis.call("JSON.ARRTRIM", "profile", "$.tags", "0", "9");
    console.log(result);
    ```
  </Accordion>

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

    const client = await createClient({ url: process.env.REDIS_URL })
      .on("error", console.error)
      .connect();
    const result = await client.json.arrTrim("profile", "$.tags", 0, 9);
    console.log(result);
    ```
  </Accordion>

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

    client = redis.from_url(os.environ["REDIS_URL"])
    result = client.json().arrtrim("profile", "$.tags", 0, 9)
    print(result)
    ```
  </Accordion>

  <Accordion title="go-redis" icon="golang" iconType="brands">
    ```go theme={"system"}
    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.JSONArrTrimWithArgs(context.Background(), "profile", "$.tags", &redis.JSONArrTrimArgs{Start: 0, Stop: func() *int { stop := 9; return &stop }()}).Result()
        if err != nil {
            panic(err)
        }
        fmt.Println(result)
    }
    ```
  </Accordion>

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

    import redis.clients.jedis.JedisPooled;

    try (JedisPooled jedis = new JedisPooled(new URI(System.getenv("REDIS_URL")))) {
      Object result = jedis.jsonArrTrim("profile", new redis.clients.jedis.json.Path("$.tags"), 0, 9);
      System.out.println(result);
    }
    ```
  </Accordion>

  <Accordion title="redis-rs" icon="rust" iconType="brands">
    ```rust theme={"system"}
    use redis::JsonCommands;

    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: redis::Value = connection.json_arr_trim("profile", "$.tags", 0, 9)?;
        println!("{result:?}");
        Ok(())
    }
    ```
  </Accordion>
</AccordionGroup>


## Related topics

- [JSON.ARRTRIM](/docs/redis/sdks/ts/commands/json/arrtrim.md)
- [JSON commands](/docs/redis/commands/json/overview.md)
- [JSON.FORGET](/docs/redis/commands/json/json-forget.md)
- [JSON.GET](/docs/redis/commands/json/json-get.md)