Compare two objects properties in JS

Question

I need to compare two objects, and find out what properties are missing. The objects are fairly big, with several levels.

I will give short example of the type of object

Answer 1

function compare(base, compared, deepSearch) {
  var missing = [];

  var compareProp = function (baseValue, comparedValue, path, deepSearch) {
    //console.log('comparing', path.join('.'));

    if (comparedValue === undefined) {
      console.log('missing key', path.join('.'));

        if (!deepSearch) {
          return;
        }
    }

    if (typeof baseValue === 'object') {
      Object.keys(baseValue).forEach(function (key) {
        compareProp(baseValue [key], comparedValue && comparedValue [key], path.concat(key), deepSearch);
      }); 
    }
  };

  Object.keys(base).forEach(function (key) {
    compareProp(base [key], compared [key], [key], deepSearch);
  });
}

UC = {};
UC.start = {}
UC.start.enableHardEccDecline = '';
UC.start.template = {};
UC.start.template.ecc = '';
UC.start.template.decline = {};
UC.start.template.decline.title = '';
UC.start.template.decline.body = '';
UC.general = {};

compare (UC, {}, true);