List or find out all properties / attributes of a JSON / javascript object

var getKeys = function(obj){
   var keys = [];
   for(var key in obj){
      keys.push(key);
   }
   return keys;
}

for e.g. suppose if the object name is options then the code would look like :

   var keys = [];
   for(var key in options){
      keys.push(key);
   }