# Properties

Properties give you a quick read of the current SDK state. Use `userChange` events to keep your UI in sync; use these properties when you need a one-off check of what tiun knows right now.

```javascript
// Quick read of current state
console.log(tiun.isAuthenticated);
console.log(tiun.user);

// Keep your UI in sync with events
tiun.on('userChange', (data) => {
  myState.isAuthenticated = data.isAuthenticated;
  myState.user = data.user;
});
```

***

## Reference

| Property               | Type               | Description                                    |
| ---------------------- | ------------------ | ---------------------------------------------- |
| `tiun.version`         | `string`           | The SDK version.                               |
| `tiun.isInitialized`   | `boolean`          | Whether `init()` has been called.              |
| `tiun.isReady`         | `boolean`          | Whether the snippet is ready to use.           |
| `tiun.isAuthenticated` | `boolean`          | Whether the user has a valid session.          |
| `tiun.user`            | `UserInfo \| null` | Current user info, or `null` if not logged in. |


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