# User & Attributes

### Managing User Data

The `NetmeraUser` class allows you to send structured information about your application's users to Netmera. The ideal time to update user attributes is **right after the user logs into your application.**

{% hint style="warning" %}
**User ID Management**

For optimal performance and data integrity:

* **Update user information at login**: It’s crucial to update the user information as soon as the user logs in.
* **Unique userId**: Ensure that each user has a unique `userId`. Assigning the same `userId` to multiple users leads to data inconsistencies and is not recommended.
  {% endhint %}

### Integrating User Identification

If our app assigns unique IDs, you can link these with Netmera accounts. Use the following code to integrate user identification:

```javascript
user.setCustomId('<your unique user id here>');
```

{% hint style="info" %}
This assigns a unique user ID to the Netmera user. To target this user, go to the **Netmera Panel**:

* Navigate to **Targeting > People > Find Person**.
* Enter the unique user ID to find and target this specific user.
  {% endhint %}

### Setting Attributes <a href="#setting-attributes" id="setting-attributes"></a>

Running this script when the user logs in to ensure the user is correctly identified. You can set profile attributes like this:

```javascript
<script>
    var netmera = netmera || [];

    netmera.push(function (api) {
        var user = api.getUser();

        user.setName('John');
        user.setSurName('Smith');
        user.setEmail('john.smit@example.com');
        user.setGsmNo('+905471234567');
        user.setCustomId('<your unique user id here>');
        
        user.addProfileAttr('attrName', 'attrValue'); // Note that 'attrName' MUST be defined on the Netmera panel!
        
        user.save()
            .then(function () {
                console.log('User saved');
            })
            .catch(function (err) {
                console.log('User save failed. err=' + err);
            });
    });
</script>
```

### Creating Custom Profile Attributes&#x20;

#### Step 1: Navigate to the Developers section

Custom profile attributes must be created and configured in the Netmera Panel before they can be used in the application.&#x20;

* Go to **Panel** > **Developers > Profile Attributes > Create New Attribute.**

#### Step 2: Fill in Attribute Details

Define the following information:

* **Name**: The unique identifier for the attribute.
* **Label**: A user-friendly name for the attribute.
* **Description**: A brief description of the attribute.
* **Data Type**: Choose the appropriate data type for the attribute.
* **Is Array**: Define whether the attribute can hold multiple values.

#### Step 3: Save the Attribute

After clicking **Save**, the custom attribute will be available for assignment to your users.

#### Step 4: Generated Code for Custom Attributes

Once the attribute is defined in the Netmera Panel, the generated code can be found at the bottom of the **Profile Attribute** page, under the **Generate Code** section. This code must be added to your Netmera Panel under **Profile Attributes > User Class**.

{% hint style="info" %}
**Private Information Considerations**

Under the **KVKK** law, the sharing of private user data is prohibited. To ensure compliance:

* **Private Information Flag**: When defining profile attributes or events, the **Private Information** feature must be selected to ensure that these attributes are not sent to the backend by the Netmera SDK.
* **SDK Enforcement**: The SDK checks for the **Private Information** flag during the `(Netmera.update(user))` call. If the flag is set, the request will not be sent to the backend.
  {% endhint %}

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