Web technology through the internet and a web browser, is attractive to modern computer music artists as it provides high accessibility and interactivity and opens to possibilities. Since the development of JSPatcher [1], an online visual programming language (VPL) for audio processing and interactive web-based programs, we have recently added various music-related features to the application, including important features that common music computing practices need, such as file management, audio buffer handling, audio plugin support, and computer-assisted composition functions. It aims to make it easier for musicians, composers or designers of multimedia projects who might be familiar with VPLs on native platforms like Max [2], PureData [3] or OpenMusic [4], to bring or create their work on the web with less effort. This paper presents the concept, implementation details and examples of these newly added features.