Аннотация:In this paper, we describe the memory management issues in JavaScript applications. Nowadays, JavaScript has become a mainstream programming environment. Modern applications in JavaScript are complex software systems. We can mention here web portals, online games, Internet of Things (Web of Things) applications, and even data mining code. Of course, JavaScript memory management becomes a critical aspect of the development (and deployment) process. In this paper, we discuss the memory leaks patterns in JavaScript code as well as the basic issues behind garbage collection in JavaScript engines