> For the complete documentation index, see [llms.txt](https://overmindjs.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://overmindjs.org/api-1/oninitialize.md).

# onInitializeOvermind

If you need to run logic as the application initializes you can use the **onInitializeOvermind** action. This action receives the application instance as the input value. You can do whatever you want here. Set initial state, run an action, configure a router etc.

{% tabs %}
{% tab title="overmind/actions.js" %}

```typescript
export const onInitializeOvermind = async ({
  state,
  actions,
  effects
}, overmind) => {
  const initialData = await effects.api.getInitialData()
  state.initialData = initialData
}
```

{% endtab %}

{% tab title="overmind/index.js" %}

```typescript
import { state } from './state'
import * as actions from './actions'

export const config = {
  state,
  actions
}
```

{% endtab %}
{% endtabs %}