Contrary to the increasing popularity of JavaScript programming language in the field of web application development, the numerical expression of evidence about the quality of solutions developed in this language is still not reliable. Based on the preliminary literature review, which is the main subject of this paper, this area has not yet been fully explored. Measurement is done by application of general and object-oriented metrics, which can reflect only general characteristics of the solution, while the specifics related to the programming language are not expressible by existing metrics. Due to the popularity of the language and the increasing number of JavaScript projects, the idea is to determine appropriate metrics and approach to measurement for their application in practice. Finally, the measurement approach will be implemented in the SSQSA Framework to enable its application. The preliminary research presented in this paper was conducted during a student course of Empirical research methods at the University of Maribor and therefore is limited in number of included papers, depth of research, and analysis of its contents, which restricts us to preliminary conclusion only, but places the foundation and justifies the described forthcoming research.