entries:updated Hook · Unhead

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# entries:updated Hook

[Copy for LLMs](https://raw.githubusercontent.com/unjs/unhead/refs/heads/main/docs/head/7.api/hooks/02.entries-updated.md)

Last updated Jan 19, 2026 by [Harlan Wilton](https://github.com/harlan-zw) in [docs: sync](https://github.com/unjs/unhead/commit/d2f86454774aa60706628b46a850653e1e4d56d9).

On this page

- [Lifecycle Position](#lifecycle-position)
- [Hook Signature](#hook-signature)
- [Usage Example](#usage-example)
- [Use Cases](#use-cases)

The `entries:updated` hook is called whenever the collection of head entries is modified, either by adding new entries, updating existing ones, or removing entries. This hook provides a way to react to changes in the application's head content.

## [Lifecycle Position](#lifecycle-position)

This is the first hook in the entry processing chain. It runs before [`entries:resolve`](https://unhead.unjs.io/docs/head/api/hooks/entries-resolve).

## [Hook Signature](#hook-signature)

```
export interface Hook {
  'entries:updated': (ctx: Unhead<any>) => HookResult
}
```

### [Parameters](#parameters)

| Name | Type | Description |
| --- | --- | --- |
| `ctx` | `Unhead<any>` | The Unhead instance containing the updated entries |

### [Returns](#returns)

`HookResult` which is either `void` or `Promise<void>`

## [Usage Example](#usage-example)

```
import { createHead } from '#imports'

const head = createHead({
  hooks: {
    'entries:updated': (head) => {
      // Log when entries are updated
      console.log('Head entries have been updated!')
      console.log(\`Current entry count: ${head.entries.size}\`)
    }
  }
})
```

## [Use Cases](#use-cases)

### [Tracking Head Changes](#tracking-head-changes)

You can use this hook to track and log changes to head entries throughout your application lifecycle:

```
import { defineHeadPlugin } from '#imports'

export const headChangeTrackingPlugin = defineHeadPlugin({
  hooks: {
    'entries:updated': (head) => {
      // Get current timestamp
      const timestamp = new Date().toISOString()

      // Log the updated state
      console.log(\`[${timestamp}] Head entries updated:\`, [...head.entries.values()].map(entry => ({
        id: entry._i,
        input: entry.input
      })))
    }
  }
})
```

### [Triggering Side Effects](#triggering-side-effects)

The hook can be used to trigger side effects when head entries change:

```
import { defineHeadPlugin } from '#imports'

export const headChangeReactionPlugin = defineHeadPlugin({
  hooks: {
    'entries:updated': (head) => {
      // Check if title has changed
      const titleEntry = [...head.entries.values()].find(entry =>
        entry.input && typeof entry.input === 'object' && 'title' in entry.input
      )

      if (titleEntry) {
        // Perform side effect when title changes
        notifyTitleChange(titleEntry.input.title)
      }
    }
  }
})

function notifyTitleChange(title) {
  // Custom notification logic
  console.log(\`Title changed to: ${title}\`)
}
```

[Edit this page](https://github.com/unjs/unhead/edit/main/docs/head/7.api/hooks/02.entries-updated.md)

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Did this page help you?

[useScript() Load third-party scripts with useScript(). Smart defaults for performance, lazy loading triggers, and API proxying for analytics and widgets.](https://unhead.unjs.io/docs/head/api/composables/use-script) [entries:resolve Hook for processing head entries before tag conversion. Add global meta tags, extract analytics data, and modify tag collections.](https://unhead.unjs.io/docs/head/api/hooks/entries-resolve)

On this page

- [Lifecycle Position](#lifecycle-position)
- [Hook Signature](#hook-signature)
- [Usage Example](#usage-example)
- [Use Cases](#use-cases)

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