# Initialization

Once the app layout and navigation is set up, we will need to initialize the app.

The app initialization code is defined inside `/assets/custom/js/init.js` file.

Define the app parameters inside:

```javascript
window.app = new Framework7({

});
```

{% hint style="info" %}
For app initialization parameters, visit <https://framework7.io/docs/app>
{% endhint %}

If you want to run any functions just after the app has been initialized, call them inside `app.on('init', function() {` event handler.

After the initialization parameters have been defined, we need to manually call the app initialization method inside `index.html` file.

In the `index.html` file, this code is added inside the `<script>` tag just before the closing `</body>` tag.

```javascript
window.onload = function() {
    app.init();
}
```