Open a project and click to Go Live++ from the status bar to turn the server on/off. Well, in Live Server Extension, I'm using a popular npm module (named live-server) and it's the core library of ...
vscode-languageclient: npm module to talk to a VSCode language server from a VSCode extension: vscode-languageserver: npm module to implement a VSCode language server using Node.js as a runtime: ...