# Webhooks

## What is a webhook

A webhook is a way for an application to notify other applications that an event occurred.
Using a webhook is a good way to tell third party providers to start some processing (CI, build, deployment ...).

The way a webhook works is by delivering information to a receiving application through HTTP requests (typically POST requests).

## How to use

To access the webhook configuration panel, go to `Settings` > `Webhooks`.

![Webhooks home](../assets/concepts/webhooks/home.png)

### Create a webhook

Click on `Add new webhook` and fill in the form.

![create](../assets/concepts/webhooks/create.png)

### Trigger a webhook

You can test out a webhook with a test event: `trigger-test`. Open the webhook you want to trigger.

![Trigger ](../assets/concepts/webhooks/trigger_start.png)

Click on the `Trigger` button.

![Trigger pending](../assets/concepts/webhooks/trigger.png)

You will see the trigger request appear and get the result.

![Trigger result](../assets/concepts/webhooks/trigger_result.png)

### Enable or disable a webhook

You can enable or disable a webhook from the list view directly.

![Disable webhook](../assets/concepts/webhooks/disable.png)

### Update a webhook

You can edit any webhook by clicking on the `pen` icon in the webhook list view.

![Update webhook](../assets/concepts/webhooks/list.png)

### Delete a webhook

You can delete a webhook by clicking on the `trash` icon.

![Delete webhook](../assets/concepts/webhooks/disable.png)

## Available events

By default Strapi webhooks can be triggered by the following events:

| Name           | Description                                     |
| -------------- | ----------------------------------------------- |
| `entry.create` | Triggered when a Content Type entry is created. |
| `entry.update` | Triggered when a Content Type entry is updated. |
| `entry.delete` | Triggered when a Content Type entry is deleted. |
| `media.create` | Triggered when a media is created.              |
| `media.delete` | Triggered when a media is deleted.              |

## Payloads

### Headers

When a payload is delivered to your webhook's URL, it will contain specific headers:

| Header           | Description                                |
| ---------------- | ------------------------------------------ |
| `X-Strapi-Event` | Name of the event type that was triggered. |

### `entry.create`

This event is triggered when a new entry is created.

**Example payload**

```json
{
  "event": "entry.create",
  "created_at": "2020-01-10T08:47:36.649Z",
  "model": "address",
  "entry": {
    "id": 1,
    "geolocation": {},
    "city": "Paris",
    "postal_code": null,
    "category": null,
    "full_name": "Paris",
    "created_at": "2020-01-10T08:47:36.264Z",
    "updated_at": "2020-01-10T08:47:36.264Z",
    "cover": null,
    "images": []
  }
}
```

### `entry.update`

This event is triggered when an entry is updated.

**Example payload**

```json
{
  "event": "entry.update",
  "created_at": "2020-01-10T08:58:26.563Z",
  "model": "address",
  "entry": {
    "id": 1,
    "geolocation": {},
    "city": "Paris",
    "postal_code": null,
    "category": null,
    "full_name": "Paris",
    "created_at": "2020-01-10T08:47:36.264Z",
    "updated_at": "2020-01-10T08:58:26.210Z",
    "cover": null,
    "images": []
  }
}
```

### `entry.delete`

This event is triggered when an entry is deleted.

**Example payload**

```json
{
  "event": "entry.delete",
  "created_at": "2020-01-10T08:59:35.796Z",
  "model": "address",
  "entry": {
    "id": 1,
    "geolocation": {},
    "city": "Paris",
    "postal_code": null,
    "category": null,
    "full_name": "Paris",
    "created_at": "2020-01-10T08:47:36.264Z",
    "updated_at": "2020-01-10T08:58:26.210Z",
    "cover": null,
    "images": []
  }
}
```

### `media.create`

This event is triggered when you upload a file on entry creation or through the media interface.

**Example payload**

```json
{
  "event": "media.create",
  "created_at": "2020-01-10T10:58:41.115Z",
  "media": {
    "id": 1,
    "name": "image.png",
    "hash": "353fc98a19e44da9acf61d71b11895f9",
    "sha256": "huGUaFJhmcZRHLcxeQNKblh53vtSUXYaB16WSOe0Bdc",
    "ext": ".png",
    "mime": "image/png",
    "size": 228.19,
    "url": "/uploads/353fc98a19e44da9acf61d71b11895f9.png",
    "provider": "local",
    "provider_metadata": null,
    "created_at": "2020-01-10T10:58:41.095Z",
    "updated_at": "2020-01-10T10:58:41.095Z",
    "related": []
  }
}
```

### `media.delete`

This event is triggered only when you delete a media through the media interface.

**Example payload**

```json
{
  "event": "media.delete",
  "created_at": "2020-01-10T11:02:46.232Z",
  "media": {
    "id": 11,
    "name": "photo.png",
    "hash": "43761478513a4c47a5fd4a03178cfccb",
    "sha256": "HrpDOKLFoSocilA6B0_icA9XXTSPR9heekt2SsHTZZE",
    "ext": ".png",
    "mime": "image/png",
    "size": 4947.76,
    "url": "/uploads/43761478513a4c47a5fd4a03178cfccb.png",
    "provider": "local",
    "provider_metadata": null,
    "created_at": "2020-01-07T19:34:32.168Z",
    "updated_at": "2020-01-07T19:34:32.168Z",
    "related": []
  }
}
```

## Developer documentation

### Available configurations

You can set webhook configurations inside the file `./config/environments/{env}/server.json`.

- `webhooks`
  - `defaultHeaders`: You can set default headers to use for your webhook requests. This option is overwritten by the headers set in the webhook itself.

**Example configuration**

```json
{
  "webhooks": {
    "defaultHeaders": {
      "Custom-Header": "my-custom-header"
    }
  }
}
```

### Securing your webhooks

Most of the time, webhooks make requests to public URLs, therefore it is possible that someone may find that URL and send it wrong information.

To prevent this from happening you can send a header with an authentication token. Using the Admin panel you would have to do it for every webhook.
Another way is to define `defaultHeaders` to add to every webhook requests.

You can configure these global headers by updating the file at `./config/environments/{env}/server.json`:

:::: tabs

::: tab "Simple token"

```json
{
  "webhooks": {
    "defaultHeaders": {
      "Authorization": "Bearer my-very-secured-token"
    }
  }
}
```

:::

::: tab "Environment variable"

```json
{
  "webhooks": {
    "defaultHeaders": {
      "Authorization": "Bearer ${ process.env.WEBHOOK_TOKEN }"
    }
  }
}
```

::::

If you are developing the webhook handler yourself you can now verify the token by reading the headers.