The scope of this work is to provide a thorough methodology for quality and performance evaluation of the most popular JavaScript framework, the jQuery Framework, by taking into account well established software quality factors and performance tests. The JavaScript programming language is widely used for web programming and increasingly, for general purpose of computing. Since the growth of its popularity and the beginning of web 2.0 era, many JavaScript frameworks have become available for programming rich client-side interactions in web applications. The jQuery project and its community serve today as a major part of web programmers. The main outcome of this work is to highlight the pros and cons of jQuery in various areas of interest and signify which and where the weak points of its code are.