---
title: "Client.hlen(key) | Grafana k6 documentation"
description: "Returns the number of fields in the hash stored at `key`."
---

# Client.hlen(key)

Returns the number of fields in the hash stored at `key`.

### Parameters

Expand table

| Parameter | Type   | Description                                |
|-----------|--------|--------------------------------------------|
| `key`     | string | key holding the hash to get the fields of. |

### Returns

Expand table

| Type              | Resolves with                                                           | Rejected when                                                      |
|-------------------|-------------------------------------------------------------------------|--------------------------------------------------------------------|
| `Promise<number>` | On success, the promise resolves with the number of fields in the hash. | If the hash does not exist, 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.hset('myhash', 'myfield', 10);
  await redisClient.hset('myhash', 'myotherfield', 20);
  await redisClient.hlen('myhash');
}
```