how to find window size javascript code example

Example 1: js window dimensions

// better than using window.innerWidth / window.innerHeight 
// because of scrollbars
const client = {
      width: document.documentElement.clientWidth,
      height: document.documentElement.clientHeight
}

Example 2: js know size of screen

alert("Your screen resolution is: " + screen.width + "x" + screen.height)