How to formulate Json request to change Css for div?

Question

css

How to formulate a Json request

{
" ": "Users", "createdby": "", (if the user belongs to the Users group and at the same time his name matches the name of the author of the article. Or if the user belongs to any other group)

function() {****}

then .x-grid3-row {visibility: visible;} ( *** article block *** is displayed as visible to him... otherwise the block is hidden .x-grid3-row {visibility: hidden;} )
}

Answer 1

1. This is done not with the help of styles, but by filtering records at the backend level (otherwise, any student will be able to "hack" your site if they wish).
   
2. The implementation method depends on the server PL and the framework (if any)
   
3. json which side is involved here?