The tutorial covers the fundamental foundations and applied aspects of using the j & # 097; vascript language for client and server development of web resources. The main trends in the development of the most common client web programming language in the light of the introduction of new ECMAScript standards are analyzed. Language learners are offered tasks of a developing and problematic type aimed at creating professional competencies in the field of web development. The manual is innovative in its structure: all examples and tasks are available in its interactive part (kodaktor.ru website), which is an e-learning tool registered with Rospatent and contains not only code samples, but also screencasts on a number of issues considered in the text part.