---
title: "Client.lset(key, index, element) | Grafana k6 documentation"
description: "Sets the list element at index `index` of the list stored at `key` to `value`."
---

# Client.lset(key, index, element)

Sets the list element at `index` to `element`.

### Parameters

Expand table

| Parameter | Type   | Description                                 |
|-----------|--------|---------------------------------------------|
| `key`     | string | key holding the list to set the element of. |
| `index`   | number | index of the element to set.                |
| `element` | string | value to set the element to.                |

### Returns

Expand table

| Type              | Resolves with                               | Rejected when                                                                                     |
|-------------------|---------------------------------------------|---------------------------------------------------------------------------------------------------|
| `Promise<string>` | On success, the promise resolves with `OK`. | If the list does not exist, or the index is out of bounds, the promise is rejected with an error. |

### Example

JavaScript ![Copy code to clipboard](/media/images/icons/icon-copy-small-2.svg) Copy

```javascript
import redis from 'k6/x/redis';

// Instantiate a new redis client
const redisClient = new redis.Client('redis://localhost:6379');

export default async function () {
  await redisClient.rpush('mylist', 'first');
  await redisClient.rpush('mylist', 'second');
  await redisClient.rpush('mylist', 'third');
  await redisClient.lset('mylist', 0, 1);
  await redisClient.lset('mylist', 1, 2);
}
```