What is the ItemDecoration for Jetpack Compose LazyColumn?

You can use the verticalArrangement parameter to add a spacing between each item using Arrangement.spacedBy().

Something like:

LazyColumn(
    verticalArrangement = Arrangement.spacedBy(8.dp),
) {
    // ...
}

The example below adds 8.dp of space in-between each item

Before and after:

If you want to add padding around the edges of the content you can use the contentPadding parameter.

  LazyColumn(
        verticalArrangement = Arrangement.spacedBy(8.dp),
        contentPadding = PaddingValues(horizontal = 24.dp, vertical = 8.dp)
  ){ ...  }

In the example above, the first item will add 8.dp padding to it’s top, the last item will add 8.dp to its bottom, and all items will have 24.dp padding on the left and the right.