# Configuration

## Overview

The configuration variables related to your app are stored in `/assets/custom/js/config.js` file.

You can store configuration variables such as app settings, API keys related to third-party services inside this file.

The example structure for storing variables is:

```javascript
window.config.facebook {
    appId: '12345678987654321'
}
```

In the same way, you can store config variables inside `window.config` object.

## Accessing Configuration Variables

You can access these variables from inside JavaScript or from inside the HTML template literals.

```javascript
// Accessing from inside JavaScript
console.log(window.config.facebook.appId);

// Or you can also access this way, once your app is initialized.
console.log(app.config.facebook.appId); // This is the recommended way
```

```html
<!-- Accessing from inside HTML template literals -->
<template>
    <div>${$f7.config.facebook.appId}}</div> <!-- After parsing, the output will be 12345678987654321 -->
</template>
```


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