Over the last decade web applications are becoming very popular. These are becoming more users oriented now-a-days. Various languages used for the development of a web application like PHP, Java, ASP.NET etc. Development of a web application is not done by individual; it is a result of team's efforts. Different type of bugs and errors are present in source code. Finding out these bugs or errors is a difficult task. Deep understanding of the language is required to detect bugs or errors in source code. Different tools are used to check the accuracy of the source code.