Compare objects before storing to firebase db. May not work for objects in arrays (not supposed to either). When jsonEqual would do, but property order is messed up.

equalObject.js

var isArray = Array.isArray || function(arg) {
  return Object.prototype.toString.call(arg) === '[object Array]';
};

function isObject(o) {
  return ((o !== null) && (typeof o === 'object') && !isArray(o));
}

function jsonEqual(object1, object2) {
  return JSON.stringify(object1) == JSON.stringify(object2);
}

function equalObject(object1, object2) {
  let keys1 = Object.keys(object1);
  let keys2 = Object.keys(object2);
  if (keys1.length != keys2.length) {
    return false;
  }
  return !keys1.some(function(p) {
    let v1 = object1[p];
    let v2 = object2[p];
    let is1 = isObject(v1);
    let is2 = isObject(v2);
    if (is1 != is2) {
      return true;
    }
    if (is1) {
      return !equalObject(v1, v2);
    }
    return !jsonEqual(v1, v2);
  });
}

var o1 = {
  first: [1, 2, 3, 4],
  second: "Some text",
  anObject: {
    testValue: "tEsT",
    testArray: ["a", "b", "c"]
  }
};

var o2 = {
  second: "Some text",
  anObject: {
    testArray: ["a", "b", "c"],
    testValue: "tEsT"
  },
  first: [1, 2, 3, 4]
};

console.log(equalObject(o1, o2));
o2.anObject.testArray.push("d");
console.log(equalObject(o1, o2));
o2.anObject.testArray.pop();
console.log(equalObject(o1, o2));
// Test for object and value/array;
o2.anObject = [1, 2, 3];
console.log(equalObject(o1, o2));