# Call Unity C# script functions from JavaScript

> Call functions from your Unity project in your JavaScript plug-in or browser.

You might want to call some Unity code from your JavaScript plug-in or browser code. For example, you might want a JavaScript UI element that triggers a Unity behaviour and needs access to that method.

The recommended way to send data or notifications to the Unity C# script from the browser’s JavaScript is to use the `SendMessage` function to call methods on GameObjects in your Unity project.

## Use the SendMessage helper function

Use `SendMessage` to call a Unity method of the Unity scripting API from JavaScript code.

There are some restrictions for what sort of methods you can pass. You can only call methods of a GameObject, not general C# methods attached to other objects. Also, only use `SendMessage` to call a method if one of the following is true:

* The method takes no parameters.
* The method has one parameter and that parameter is a single string.
* The method has one parameter and that parameter is a single number.

Methods with more than one parameter or with parameters of other types can't be called using `SendMessage`.

## Example SendMessage code

To make the call from a JavaScript plug-in embedded in your project, use the following code:

```lang-js
MyGameInstance.SendMessage(objectName, methodName, value);
```

* `objectName` is the name of an object in your scene.
* `methodName` is the name of a method in the script, currently attached to that object.
* `value` can be a string, a number, or can be empty.

The following code is a further example that shows each of the types of methods that you can call with different parameters.

```lang-js
MyGameInstance.SendMessage('MyGameObject', 'MyFunction');
MyGameInstance.SendMessage('MyGameObject', 'MyFunction', 5);
MyGameInstance.SendMessage('MyGameObject', 'MyFunction', 'MyString');
```

To make a call from the global scope of the embedding page, refer to [Call JavaScript functions from global scope](/engine/6000.6/manual/platform-specific/webgl/develop/interactingwithbrowserscripting/web-interacting-browser-js-to-unity.md#global-scope).

## Additional resources

* [Interaction with browser scripting](/engine/6000.6/manual/platform-specific/webgl/develop/interactingwithbrowserscripting.md)

* [Set up your JavaScript plug-in](/engine/6000.6/manual/platform-specific/webgl/develop/interactingwithbrowserscripting/web-interacting-browser-js.md)

* [Call JavaScript functions from Unity C# scripts](/engine/6000.6/manual/platform-specific/webgl/develop/interactingwithbrowserscripting/web-interacting-browser-js-to-unity.md)

* [Call C/C++/C# functions from Unity C# scripts](/engine/6000.6/manual/platform-specific/webgl/develop/interactingwithbrowserscripting/web-interacting-browsers-c-to-unity.md)

* [Create callbacks between Unity C#, JavaScript, and C/C++/C# code](/engine/6000.6/manual/platform-specific/webgl/develop/interactingwithbrowserscripting/web-interacting-browser-example.md)