---
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title: JavaScript API
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---

# JavaScript API

The JavaScript API lists the publicly accessible methods for each object that you can use in JavaScript code, such as a controller or helper. The `$A` namespace is the entry point for using the framework in JavaScript code.

-   **[$A namespace](https://developer.salesforce.com/docs/platform/aura-platform/guide/ref-jsapi-dollara.md)**  


    The `$A` namespace is the entry point for using the framework in JavaScript code.

-   **[Action](https://developer.salesforce.com/docs/platform/aura-platform/guide/ref-jsapi-action.md)**  


    `Action` contains methods to work with JavaScript actions that you can use to communicate with Apex classes.

-   **[AuraLocalizationService](https://developer.salesforce.com/docs/platform/aura-platform/guide/ref-jsapi-auralocalizationservice.md)**  


    `AuraLocalizationService` provides methods for formatting and localizing dates. Use `$A.localizationService` to use the methods in `AuraLocalizationService`.

-   **[Component](https://developer.salesforce.com/docs/platform/aura-platform/guide/ref-jsapi-component.md)**  


    `Component` contains methods to work with components.

-   **[Event](https://developer.salesforce.com/docs/platform/aura-platform/guide/ref-jsapi-event.md)**  


    `Event` contains methods to work with events. Use an event to communicate between components.

-   **[Util](https://developer.salesforce.com/docs/platform/aura-platform/guide/ref-jsapi-util.md)**  


    `Util` contains utility methods.