---
title: "Client.sadd(key, members) | Grafana k6 documentation"
description: "Adds the specified members to the set stored at `key`."
---

# Client.sadd(key, members)

Adds the specified members to the set stored at `key`. Specified members that are already a member of this set are ignored. If key does not exist, a new set is created before adding the specified members.

### Parameters

Expand table

| Parameter | Type                                              | Description                                |
|-----------|---------------------------------------------------|--------------------------------------------|
| `key`     | string                                            | key holding the set to add the members to. |
| `members` | a variadic array of strings, numbers, or booleans | members to add to the set.                 |

### Returns

Expand table

| Type              | Resolves with                                                                                                                               | Rejected when |
|-------------------|---------------------------------------------------------------------------------------------------------------------------------------------|---------------|
| `Promise<number>` | On success, the promise resolves with the number of elements that were added to the set, not including elements already present in the set. |               |

### 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.sadd('myset', 'foo');
  await redisClient.sadd('myset', 'bar');

  const isit = await redisClient.sismember('myset', 'foo');
  if (isit === false) {
    throw new Error('sismember should have returned true');
  }
}
```