How to check for empty Object in JavaScript?

10n1myo.js

//ES 7+
Object.entries(obj).length === 0 && obj.constructor === Object

//ES 5+
Object.keys(obj).length === 0 && obj.constructor === Object

//ES 5-
function isEmpty(obj) {
  for(var prop in obj) {
    if(obj.hasOwnProperty(prop)) {
      return false;
    }
  }

  return JSON.stringify(obj) === JSON.stringify({});
}