# session.Session.activeWindow

- **Module:** session
- **Package:** libtmux
- **Language:** TypeScript
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-ts/blob/073b9d7dedad900bff6f5ec0ea47794e40225870/packages/libtmux/src/session.ts#L327
- **Page:** https://libtmux.org/en/ts/latest/reference/session-session-activewindow/

```
activeWindow(): Window | undefined
```

The window tmux marks active in this session.

## Examples

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

## Guides

Pages that discuss `activeWindow`.

- [Traversal](/en/ts/latest/topics/traversal/)

## In other ports

The session's active window

| Language | Equivalent |
| --- | --- |
| Python | [`libtmux.Session.active_window`](/en/py/latest/reference/libtmux-session-active_window/) (property) |
| Rust | [`session.Session.active_window`](/en/rs/latest/reference/session-session-active_window/) (method) |
| Go | [`tmux.Session.ActiveWindow`](/en/go/latest/reference/tmux-session-activewindow/) (method) |
| Java | [`io.github.libtmux.Session.activeWindow`](/en/java/latest/reference/io-github-libtmux-session-session-activewindow/) (method) |
| C# | [`LibTmux.Session.ActiveWindow`](/en/csharp/latest/reference/libtmux-session-activewindow/) (property) |
| C++ | [`libtmux::Session::active_window`](/en/cxx/latest/reference/libtmux-session-active_window/) (method) |
| Swift | no accessor; `Pane.isActive` is a flag on the pane, so the active one is found by filtering a listing |

No equivalent is recorded in Ruby, Lua, PowerShell, Julia, Elixir, Kotlin, Scala or F#.