scrub.js

/**
 * Removes {}, '', null, undefined values from objects and arrays recursively
 * WARNING: This should be used only on objects that are known to not have
 *  circular refrences. User input can't have circular dependencies because
 *  it could not be JSON.stringified if it did, therefore user input is safe.
 */
function scrub(obj) {
	for(var prop in obj) {
		if(_.isArray(obj[prop])) {
			obj[prop].forEach(function() {
				scrub(obj[prop]);
			});

			var neswArray = [];
			obj[prop].forEach(function(element) {
				if(element !== null) {
					newArray.push(element);
				}
			});
			obj[prop] = newArray;
		} else if(_.isObject(obj[prop])) {
			scrub(obj[prop]);
			if(_.isEmpty(obj[prop])) delete obj[prop];
		} else if(obj[prop] === '' || obj[prop] === null || obj[prop] === undefined) {
			delete obj[prop];
		}
	}
}