With vscode-languageclient@5.1.0-next.9, you can specify a JSON log output format with [langId].trace.server as follows:
```
"languageServerExample.trace.server": {
  "format": "json",
  "verbosity": "verbose"
}
```
A webview build of the LSP Inspector can be downloaded here:
When using the Webview LSP Inspector, it will open a WebSocket Server taking incoming connection that sends logs following this format.
You can stream the JSON log of any Language Server using vscode-languageclient to the LSP Inspector, and it will show a live view of the LSP connection.

Functionality

This Language Server works for plain text file. It has the following language features:

Completions
Diagnostics regenerated on each file change or configuration change

It also includes an End-to-End test.

Structure

.
├── client // Language Client
│   ├── src
│   │   ├── test // End to End tests for Language Client / Server
│   │   └── extension.ts // Language Client entry point
├── package.json // The extension manifest.
└── server // Language Server
    └── src
        └── server.ts // Language Server entry point

Compile and Run

Run npm install in this folder. This installs all necessary npm modules in both the client and server folder
Open VS Code on this folder.
Press Ctrl+Shift+B to compile the client and server.
Switch to the Debug viewlet.
Select Launch Client from the drop down.
Run the lauch config.
If you want to debug the server as well use the launch configuration Attach to Server
In the [Extension Development Host] instance of VSCode, open a document in 'plain text' language mode.
- Type j or t to see Javascript and TypeScript completion.
- Enter text content such as AAA aaa BBB. The extension will emit diagnostics for all words in all-uppercase.