var user = { "first_name":"taylor", "last_name":"hawkes", "full_name": "taylor hawkes" }; var userCleaned = _.pickBy(user, function(value, key) { return (key === "first_name" || key === "last_name"); }); //userCleaned is now: //{ // "first_name": "taylor", // "last_name": "hawkes" //}