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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Does anyone knows how this protocol works? https://microsoft.github.io/language-server-protocol/
The example they give uses Node Inter Process Communication (IPC) https://github.com/microsoft/vscode-extension-samples/blob/main/lsp-sample/server/src/server.ts
https://github.com/ebkalderon/tower-lsp is a generalized LSP implementation in a lower-level language (Rust) so you may get a better idea by reading through that repo. It seems that the server opens a TCP socket that the client later connects to, but I'm not really sure.