# tmux.WindowRel.MarshalJSON

- **Module:** tmux.WindowRel
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** method
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/filter_generated.go#L2445
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-windowrel-marshaljson/

```
tmux.WindowRel.MarshalJSON() -> ([]byte, error)
```

MarshalJSON validates and encodes the window relation; failures wrap [ErrInvalidFilter].