# JavaScript files
JavaScript files help organize custom functions and variables. They're perfect for storing reusable helpers and utilities within components and actions.
You can create a JS file from the *Actions* panel - simply select this option after clicking on the *plus* sign.
All top-level variables and functions defined in a JS file are accessible in Components and Actions.
## Scope
JavaScript files are scoped based on their creation context:
* **App-level** files - can be utilized across any component or action within the app
* **Page-level** files - restricted to their specific page
When multiple functions with the same name are defined in a scope, then the most recent definition will take precedence.
## Cross usage
Functions and variables defined in one JS file can also be used in others.
{% hint style="success" %}
Since JavaScript files are added to a page as scripts, you can only reference definitions from files loaded earlier.
{% endhint %}
## Global and custom libraries
JavaScript files can also contain *custom* libraries in the custom code section as well as *default* libraries like `moment` and `lodash`.
## Debugging
You can troubleshoot any issues you have with a JS file by inserting a console log statement and running the function within an action or component, for example:
```javascript
function dateWithLabel(date) {
console.log('debug!', date);
return 'Date: ' + moment(date).format('MM/dd/yyyy');
}
```
The logs will appear in the **Logs** panel, prefixed with the file name where the code resides.
{% hint style="info" %}
Code that contains invalid JavaScript and cannot be parsed is not incorporated into the page.
{% endhint %}
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