> For the complete documentation index, see [llms.txt](https://docs.uibakery.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.uibakery.io/concepts/custom-javascript/javascript-files.md).

# 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.

<figure><img src="/files/0pg76ASBichVwSZLhOyx" alt=""><figcaption></figcaption></figure>

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.&#x20;

{% hint style="success" %}
Since JavaScript files are added to a page as scripts, you can only reference definitions from files loaded earlier.
{% endhint %}

<figure><img src="/files/9Rry8jUIzwO3AmbhHj2e" alt=""><figcaption></figcaption></figure>

## 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`.

<figure><img src="/files/OMe3Qesc4lYqfessFqsb" alt=""><figcaption></figcaption></figure>

## 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.

<figure><img src="/files/QxUniVhzXa7odb3TggKW" alt=""><figcaption></figcaption></figure>

{% hint style="info" %}
Code that contains invalid JavaScript and cannot be parsed is not incorporated into the page.
{% endhint %}


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