# `window:effective_config()`

*Since: 20210314-114017-04b7cedd*

Returns a lua table representing the effective configuration for the Window.
The table is in the same format as that used to specify the config in
the `wezterm.lua` file, but represents the fully-populated state of the
configuration, including any CLI or per-window configuration overrides.

Note: changing the config table will NOT change the effective window config;
it is just a copy of that information.

If you want to change the configuration in a window, look at [set_config_overrides](set_config_overrides.md).

This example will log the configured font size when `CTRL-SHIFT-E` is pressed:

```lua
local wezterm = require'wezterm'

wezterm.on("show-font-size", function(window, pane)
  wezterm.log_error(window:effective_config().font_size);
end)

return {
  keys = {
    {key="E", mods="CTRL", action=wezterm.action{EmitEvent="show-font-size"}},
  },
}
```