Even with all the flaws that we will find in an Ajax based website, there are security measures that we could do to ensure security in our website. Before we go to different security measures, let us first note one of the biggest problems in an Ajax based website and application: Source Code Availability. Some call it �Overly Granular Server API� referring to the API built from the server which provides little to nothing in terms of security. Almost every hack that I have seen related to Ajax stems from this security flaw. In simple words, the biggest problem in Ajax is the availability of source code even to regular users.