# session.Session.activeWindow

- **Module:** session.Session
- **Package:** @libtmux/libtmux
- **Language:** TypeScript
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ts/blob/2cb93308200da38a26b59876618116850f110607/packages/libtmux/src/session.ts#L253
- **Page:** https://libtmux.org/reference/ts/session-session-activewindow/

```
session.Session.activeWindow() -> Window | undefined
```

The window tmux marks active in this session.

## Example

```ts
session.activeWindow?.name;
```