Many visual programming languages (VPLs) which include Max or PureData provide a graphic canvas for connecting between functions or data. This canvas, also called a patcher, is basically a graph meant to be interpreted as a dataflow computation by the system. Some VPLs are used for multimedia performance or content generation since the UI system is generally a significant element of the language. This paper presents a web-based VPL, JSPatcher, which allows you to build audio graphs using the Web Audio API. Users can use a web browser to graphically design and run DSP algorithms using domain specific languages (DSL) for audio processing such as FAUST or Gen and execute them in a dedicated high priority thread called AudioWorklet. The application can also be utilized to create interactive programs and shareable artworks online with other JavaScript language built-ins, Web APIs, web-based audio plugins or external JavaScript modules.