> ## Documentation Index
> Fetch the complete documentation index at: https://docs.paraminternationalltd.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Identify Users
> Use identify after a user logs in, registers, or when their profile information becomes available.
The method connects anonymous website activity with a known user. This helps you to target user through ads and many more.
## Identify a user
Pass your application’s unique user ID to the `identify()` method.
```javascript npm theme={null}
TwinalyzeAnalytics.identify("USER_123");
```
```html CDN theme={null}
```
Initialize the Twinalyze SDK before calling `identify()`.
## Identify with user properties
Pass user information as the second parameter.
```javascript npm theme={null}
TwinalyzeAnalytics.identify("USER_123", {
name: "John Doe",
email: "john@example.com",
phone: "+919876543210",
plan: "Growth",
company: "Example Company",
});
```
```html CDN theme={null}
```
## Update user properties
Call `identify()` again when important user information changes, such as the user’s subscription plan or company.
```javascript npm theme={null}
TwinalyzeAnalytics.identify("USER_123", {
name: "John Doe",
email: "john@example.com",
plan: "Enterprise",
company: "Example Company",
});
```
```javascript CDN theme={null}
window.TwinalyzeAnalytics.identify("USER_123", {
name: "John Doe",
email: "john@example.com",
plan: "Enterprise",
company: "Example Company",
});
```
## Parameters
| Parameter | Type | Required | Description |
| -------------------- | ------ | -------- | -------------------------------------------------------------- |
| `userId` | String | Yes | Permanent and unique identifier of the user. |
| `identifyProperties` | Object | No | User information such as name, email, phone, plan, or company. |
## Registration example
Call `identify()` after a user completes registration.
```javascript npm theme={null}
function handleRegistration(user) {
TwinalyzeAnalytics.identify(user.id, {
name: user.name,
email: user.email,
plan: user.plan,
company: user.company,
});
}
```
```javascript CDN theme={null}
function handleRegistration(user) {
window.TwinalyzeAnalytics.identify(user.id, {
name: user.name,
email: user.email,
plan: user.plan,
company: user.company,
});
}
```
## When to call identify
Call `identify()` when:
* A user successfully logs in
* A user completes registration
* User profile information becomes available
* User properties such as plan or company change
Use a permanent and unique user ID from your application. Do not use a display name, session ID, or another value that may change.