Swagger extension throws this error when opening VSCode user settings JSON

[stereokai]

workbench.main.js:238 [Extension Host] stack trace: SyntaxError: Error parsing c:/Users/User/AppData/Roaming/Code/User/settings.json 
end of the stream or a document separator is expected at line 3, column 21:
        "editor.tabSize": 2,
                        ^
    at onError (C:\Users\User\.vscode\extensions\arjun.swagger-viewer-2.2.2\node_modules\json-schema-ref-parser\lib\parse.js:128:20)

YAMLException: end of the stream or a document separator is expected at line 3, column 21:
        "editor.tabSize": 2,
                        ^