How to add an additional message in response? (RESTful)

[Paul Benedict Jabines]

I have a validateXxx() where I return a message "Name already exist." for
some conditions. I believe the response can be a json object. So how to add
another key - value in the response?

{
      ....
     "SomeMessage": "Name already exist."
      ....
}

Thanks,
- Paul

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