js_empty_obj_val_check.js

var empty_obj = {};
if(Object.entries(empty_obj)==undefined)
{
  console.log('is undefined');
}
else if(Object.entries(empty_obj)==null)
{
  console.log('is null');
}
else if(Object.entries(empty_obj)=={})
{
  console.log('is {}');
}
else if(Object.entries(empty_obj)==[])
{
  console.log('is []');
}
else if(Object.entries(empty_obj)=='')
{
  console.log('is empty');
}
else
{
  console.log('is ? : ');
  console.log(Object.entries(empty_obj));
}
// => is empty