CODE EXAMPLE FOR JAVASCRIPT

react detect page width

import React, { useState, useEffect } from 'react'

export default function ScreenSize() {
  const [windowDimenion, detectHW] = useState({
    winWidth: window.innerWidth,
    winHeight: window.innerHeight,
  })

  const detectSize = () => {
    detectHW({
      winWidth: window.innerWidth,
      winHeight: window.innerHeight,
    })
  }

  useEffect(() => {
    window.addEventListener('resize', detectSize)

    return () => {
      window.removeEventListener('resize', detectSize)
    }
  }, [windowDimenion])

  return (
    <div>
      <p>Width: <strong>{windowDimenion.winWidth}</strong></p>
      <p>Height: <strong>{windowDimenion.winHeight}</strong></p>
    </div>
  )
}