---
title: Error handling 
description: Properly handle unexpected errors.
sidebar:
  order: 9
---

Error handling is important in any application, especially one which has a long lifetime of running.

## Handling errors in command and event modules

To capture errors, enable the 'error' event in sern's global event manager.

import { FileTree } from '@astrojs/starlight/components';

<FileTree>
- src/
    - commands/
    - events/
        - **error.js**
    - index.js 
    - config.js
    - dependencies.d.ts 
</FileTree>


:::tip 

Don't forget to enable event handling!
```js title='src/config.js'
export const events = "./dist/events"
```

::


```js
import { EventType, eventModule } from '@sern/handler'

export default eventModule({ 
    type: EventType.Sern,
    name: 'error',
    execute: (err) => {
        console.log('caught', err)
    }
})
```

If the error handler is not set, sern's behavior is to crash the application. 
This respects [node.js's default behavior](https://nodejs.org/api/events.html#error-events)


:::caution

    Be careful about errors thrown IN the error handler. 
    If this happens, a memory leaks occurs and your bot **will crash**.

:::

