---
title: Global Hooks
label: Globals
order: 30
desc: Hooks can be added to any Global and allow you to validate data, flatten locales, hide protected fields, remove fields and more.
keywords: hooks, globals, config, configuration, documentation, Content Management System, cms, headless, javascript, node, react, nextjs
---

Global Hooks are [Hooks](./overview) that run on [Global](../configuration/globals) Documents. They allow you to execute your own logic during specific events of the Document lifecycle.

To add Hooks to a Global, use the `hooks` property in your [Global Config](../configuration/globals):

```ts
import type { GlobalConfig } from 'payload';

export const GlobalWithHooks: GlobalConfig = {
  // ...
  hooks: { // highlight-line
    // ...
  },
}
```

<Banner type="info">
  **Tip:**
  You can also set hooks on the field-level to isolate hook logic to specific fields. [More details](./fields).
</Banner>

## Config Options

All Global Hooks accept an array of [synchronous or asynchronous functions](./overview#async-vs-synchronous). Each Global Hook receives specific arguments based on its own type, and has the ability to modify specific outputs.

```ts
import type { GlobalConfig } from 'payload';

const GlobalWithHooks: GlobalConfig = {
  // ...
  // highlight-start
  hooks: {
    beforeValidate: [(args) => {...}],
    beforeChange: [(args) => {...}],
    beforeRead: [(args) => {...}],
    afterChange: [(args) => {...}],
    afterRead: [(args) => {...}],
  }
  // highlight-end
}
```

### beforeValidate

Runs before the `update` operation. This hook allows you to add or format data before the incoming data is validated.

```ts
import type { GlobalBeforeValidateHook } from 'payload'

const beforeValidateHook: GlobalBeforeValidateHook = async ({
  data,
  req,
  originalDoc,
}) => {
  return data
}
```

The following arguments are provided to the `beforeValidate` hook:

| Option                   | Description                                                                                                                                                                                                           |
| ------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **`global`**         | The [Global](../configuration/globals) in which this Hook is running against.                                                                                                                       |
| **`context`**            | Custom context passed between Hooks. [More details](./context).                                                                                                                              |
| **`data`**               | The incoming data passed through the operation.                                                                                 |
| **`originalDoc`**        | The Document before changes are applied.                                                                                        |
| **`req`**                | The [Web Request](https://developer.mozilla.org/en-US/docs/Web/API/Request) object. This is mocked for [Local API](../local-api/overview) operations.                                                                                                                                                  |

### beforeChange

Immediately following validation, `beforeChange` hooks will run within the `update` operation. At this stage, you can be confident that the data that will be saved to the document is valid in accordance to your field validations. You can optionally modify the shape of data to be saved.

```ts
import type { GlobalBeforeChangeHook } from 'payload'

const beforeChangeHook: GlobalBeforeChangeHook = async ({
  data,
  req,
  originalDoc,
}) => {
  return data
}
```

The following arguments are provided to the `beforeChange` hook:

| Option                   | Description                                                                                                                                                                                                           |
| ------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **`global`**         | The [Global](../configuration/globals) in which this Hook is running against.                                                                                                                       |
| **`context`**            | Custom context passed between hooks. [More details](./context).                                                                                                                              |
| **`data`**               | The incoming data passed through the operation.                                                                                 |
| **`originalDoc`**        | The Document before changes are applied.                                                                                        |
| **`req`**                | The [Web Request](https://developer.mozilla.org/en-US/docs/Web/API/Request) object. This is mocked for [Local API](../local-api/overview) operations.                                                                                                                                                  |

### afterChange

After a global is updated, the `afterChange` hook runs. Use this hook to purge caches of your applications, sync site data to CRMs, and more.

```ts
import type { GlobalAfterChangeHook } from 'payload'

const afterChangeHook: GlobalAfterChangeHook = async ({
  doc,
  previousDoc,
  req,
}) => {
  return data
}
```

The following arguments are provided to the `afterChange` hook:

| Option                   | Description                                                                                                                                                                                                           |
| ------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **`global`**         | The [Global](../configuration/globals) in which this Hook is running against.                                                                                                                       |
| **`context`**            | Custom context passed between hooks. [More details](./context).                                                                                                                              |
| **`doc`**               | The resulting Document after changes are applied. |
| **`previousDoc`**        | The Document before changes were applied. |
| **`req`**                | The [Web Request](https://developer.mozilla.org/en-US/docs/Web/API/Request) object. This is mocked for [Local API](../local-api/overview) operations.                                                                                                                                                  |

### beforeRead

Runs before `findOne` global operation is transformed for output by `afterRead`. This hook fires before hidden fields are removed and before localized fields are flattened into the requested locale. Using this Hook will provide you with all locales and all hidden fields via the `doc` argument.

```ts
import type { GlobalBeforeReadHook } from 'payload'

const beforeReadHook: GlobalBeforeReadHook = async ({
  doc,
  req,
}) => {...}
```

The following arguments are provided to the `beforeRead` hook:

| Option                   | Description                                                                                                                                                                                                           |
| ------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **`global`**         | The [Global](../configuration/globals) in which this Hook is running against.                                                                                                                       |
| **`context`**            | Custom context passed between hooks. [More details](./context).                                                                                                                              |
| **`doc`**               | The resulting Document after changes are applied. |
| **`req`**                | The [Web Request](https://developer.mozilla.org/en-US/docs/Web/API/Request) object. This is mocked for [Local API](../local-api/overview) operations.                                                                                                                                                  |

### afterRead

Runs as the last step before a global is returned. Flattens locales, hides protected fields, and removes fields that users do not have access to.

```ts
import type { GlobalAfterReadHook } from 'payload'

const afterReadHook: GlobalAfterReadHook = async ({
  doc,
  req,
  findMany,
}) => {...}
```

The following arguments are provided to the `beforeRead` hook:

| Option         | Description                                                                                                                                           |
| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
| **`global`**   | The [Global](../configuration/globals) in which this Hook is running against.                                                                         |
| **`context`**  | Custom context passed between hooks. [More details](./context).                                                                                       |
| **`findMany`** | Boolean to denote if this hook is running against finding one, or finding many (useful in versions).                                                  |
| **`doc`**      | The resulting Document after changes are applied.                                                                                                     |
| **`query`**    | The [Query](../queries/overview) of the request.                                                                                                      |
| **`req`**      | The [Web Request](https://developer.mozilla.org/en-US/docs/Web/API/Request) object. This is mocked for [Local API](../local-api/overview) operations. |

## TypeScript

Payload exports a type for each Global hook which can be accessed as follows:

```ts
import type {
  GlobalBeforeValidateHook,
  GlobalBeforeChangeHook,
  GlobalAfterChangeHook,
  GlobalBeforeReadHook,
  GlobalAfterReadHook,
} from 'payload'
```
