How to Find the Size of LocalStorage

Sometimes, an error occurred (Failed to execute ‘setItem’ on ‘Storage’: Setting the value of ‘xxxxx’ exceeded the quota Vue) when adding data to local storage due to storage being full, but not sure which one uses more and how much it is, Found below code which is very helpful. one line version var _lsTotal=0,_xLen,_x;for(_x in localStorage){ if(!localStorage.hasOwnProperty(_x)){continue;} _xLen= ((localStorage[_x].length + _x.length)* 2);_lsTotal+=_xLen; console.log(_x.substr(0,50)+" = "+ (_xLen/1024).toFixed(2)+" KB")};console.log("Total = " + (_lsTotal / 1024).