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, 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, PureData or OpenMusic, 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.