JAVASCRIPT

check device width using js

const screenWidth  = window.screen.width;
const screenHeight = window.screen.height;

device width js

window.screen.availWidth

Javascript get device width

const mq = window.matchMedia( "(min-width: 500px)" );

if (mq.matches) {
  // window width is at least 500px
} else {
  // window width is less than 500px
}