This is in the contributes part of the package.json

json "contributes": { "configuration": { "type": "object", "title": "Example configuration", "properties": { "languageServerExample.maxNumberOfProblems": { "scope": "resource", "type": "number", "default": 100, "description": "Controls the maximum number of problems produced by the server." }, "languageServerExample.trace.server": { "scope": "window", "type": "string", "enum": [ "off", "messages", "verbose" ], "default": "off", "description": "Traces the communication between VS Code and the language server." } } } },