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

# feature_used Event

> Track when a specific feature is used to understand product adoption.

Fires when a specific feature is used. Track key features to understand product adoption and identify power users.

## JavaScript

```javascript theme={null}
window._upstack('track', 'feature_used', {
  accountId: 'acct_abc123',
  userId: 'usr_xyz789',
  featureId: 'feat_export',
  featureName: 'CSV Export',
  featureCategory: 'reporting'
});
```

## Properties

| Property        | Type   | Required | Description               |
| --------------- | ------ | -------- | ------------------------- |
| accountId       | string | Yes      | Account identifier        |
| featureId       | string | Yes      | Feature identifier        |
| userId          | string | No       | User who used the feature |
| featureName     | string | No       | Feature display name      |
| featureCategory | string | No       | Feature category          |

## When to Fire

* When key features are used
* When premium features are accessed
* When usage-based actions are performed