> ## Documentation Index
> Fetch the complete documentation index at: https://docs.trysignal.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Identify

> Identify users with signal.identify()

# Node — Identify

Identify a user and set their properties with `signal.identify(options)`. Sends an `$identify` event. Pass `sessionId` and `windowId` from request headers when you want to correlate with the client session.

## identify(options)

| Option       | Type         | Required | Description                        |
| ------------ | ------------ | -------- | ---------------------------------- |
| `distinctId` | `string`     | yes      | User identifier                    |
| `properties` | `UserTraits` | no       | User properties to set             |
| `sessionId`  | `string`     | no       | From header for client correlation |
| `windowId`   | `string`     | no       | From header for client correlation |

## Example

```typescript theme={null}
const { sessionId, windowId, distinctId } = getSessionInfo(req);

signal.identify({
  distinctId: 'user_123',
  properties: { email: 'user@example.com', name: 'Jane' },
  sessionId,
  windowId,
});
```

## See also

* [Set person properties](/docs/integrations/node/set-person-properties) — setPersonProperties, setPersonPropertiesOnce
* [Capture](/docs/integrations/node/capture) — Track events