This thesis examines the evolution of library management systems, focusing on the importance of switching to online tools. It is divided into five chapters, each addressing the shortcomings of traditional methods, the technological aspects of web apps, previous studies, and the implementation of online library management systems. Chapter 1 provides an overview of the development of traditional systems, while Chapter 2 explores web apps and their underlying technologies. Chapter 3 examines previous studies, while Chapter 4 focuses on the unique features of online library management systems. Chapter 5 outlines the future of the system, focusing on AI and machine learning to enhance security and usefulness.