Check is object matches expected interface in Javascript

js-interface-validation.js

/**
  * Check if object matches interface including type of property
  * Nested propertys not supported for now
  */
function checkInterface(originalObject, interfaceObject, disableTypeChecking) {
	for (var key in interfaceObject) {
		// If original object does not contain property of interface
		if (!originalObject.hasOwnProperty(key)) {
			return false;
		}
		
		// If original object property type does not equal interface object type
		// disableTypeChecking if originalObject can contain properties with value null/undefined and your
		// interface does not have null/undefined property
		if (!disableTypeChecking && typeof originalObject[key] !== typeof interfaceObject[key]) {
			return false;
		}
	}
	
	return true;
}