Check indexedDB usage size

indexedDB_info.js

// First method
navigator.storage.estimate().then((data)=>console.log(data))

// OR second method
navigator.webkitTemporaryStorage.queryUsageAndQuota ( 
  function(usedBytes, grantedBytes) {  
      console.log('we are using ', usedBytes, ' of ', grantedBytes, 'bytes');
  }, 
  function(e) { 
    console.log('Error', e);  
  }
);