> For the complete documentation index, see [llms.txt](https://logbox.ortusbooks.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://logbox.ortusbooks.com/5.x/configuration/configuring-logbox/adding-categories-granularly.md).

# Adding Categories Granularly

You can also add categories with very granular information using the category() method. This method will allow you to add a category definition with a range of severity levels and even a list of which appenders to respond to.

```javascript
public void category(
    string name,
    [numeric levelMin='0',]
    [numeric levelMax='4',]
    [string appenders='*']
)
```

## Parameters:

| Name      | Description                                                                                                                                                                    |
| --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| name      | A unique name for the category to register. Only unique names can be registered per instance.                                                                                  |
| levelMin  | The default min log level for this category. (OPTIONAL. Defaults to 0 \[FATAL].)                                                                                               |
| levelMax  | The max default log level for this category. (OPTIONAL. Defaults to 4 \[DEBUG].)                                                                                               |
| appenders | A list of appender names to configure this category with else it will use all the appenders in the root logger. You can also use \* to add all registered apenders. (OPTIONAL) |

## Example

```javascript
//log all email service messages to the MyLogFileAppender and the Console.
config.category( name="org.model.EmailService", appenders="MyLogFileAppender,Console" );
```


---

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