# What is the Robin User Token (RUT)?

Just like in your company’s database, every employee has a unique identifier; in many cases, this identifier is referred to as an ID — the same logic is applied to Robin but with a different name. The **Robin User Token (RUT)** is used to identify every user that dispatches or receives messages and events in your [Robin App](/messaging-with-robin/guides/how-does-robin-messaging-work.md#the-robin-app).

### When to use a RUT

The Robin User Token must be used for any messaging operation on Robin, as it is a means of identification for any user. Sending messages with an invalid token or without a token would result in a “No Identity” record of your [Robin Dashboard](/fundamentals.md#robin-account-and-dashboard). The RUT also helps with the visibility of individual and group messaging activities.

{% hint style="warning" %}
The RUT is a necessary prerequisite to building any Robin use case; any application of Robin might not function to its full potential without a valid RUT.
{% endhint %}

### Creating a valid RUT

Recall that a RUT is synonymous with an ID field in a database; hence, the RUT is mapped to metadata for a unique user; this metadata is used to create the RUT. The metadata is a key-value pair (an object) that can contain as much information about a user.

Creating a valid RUT is easy; it can be done on the server (back-end) or on the client side (front-end).

{% hint style="info" %}
We advise that **RUTs** are created for each user on the server upon successful registration.
{% endhint %}

### Javascript

```jsx
const robin = new Robin('YOUR_API_KEY', true)

const response = await robin.**createUserToken**({
  meta_data: {
    username: 'USER_NAME',
  },
});
```

### Go

```go
robin := Robin{ Secret: "YOUR_API_KEY", Tls: true,}

token, err := robin.**CreateUserToken**(
	UserToken{
		MetaData: map[string]interface{}{
			"name": "USER_NAME",
		}
	}
)
```

### Dart

```dart
Map<String, dynamic> metadata = {
	"name": "USER_NAME"
};

final String robinToken = await RobinCore.**createUserToken**("YOUR_API_KEY", metaData);
```

### Python

```python
robin = Robin("YOUR_API_KEY", True)

response = robin.**create_user_token**(data={
    "meta_data":{
        "name": "USER_NAME",
    }
})
```

To install Robin packages and libraries referenced in the code snippets above, check out [Samples and Resources](/samples-and-resources.md)


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