Hi Janus,

Thanks for showing interest in our Plugin.

You will not be able to achieve this with the free/Lite wpDataTables, but with Premium version you would have these Advanced Filtering options as explained in this Documentation.

So i will show you an example how you would to this with the full/premium wpDataTables.

You can also test this solution on our Demo Site here.

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We have a workaround for non-editable ( linked to a file source) tables, 

to restrict only showing the rows for the currently logged-in user.

I will show you an example with another Placeholder "Current User ID", but you will be able to use the same way, just change the Placeholder to "%CURRENT_USER_LOGIN%" .

And this is an example using Excel as source File, but you can do the same with a JSON Source File.

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- First, you would have to add a custom "user_id" column on the source Excel side ( in your case JSON file), which you can hide if needed in our plugin from the front-end. 

We will add a predefined filter value to it, using a Place Holder "Current User ID";

- Check that the filter type is set as "Text", as shown on this screenshot.

- Here is how an example table linked to a source file looks before we make any changes, with visible filters above the table.

And now, when we set the pre-filter, with Administrator logged in ( In our case, the user ID is 1), we only see rows matching that user ID.

- (If you need more detailed information about using Place Holders in wpDataTables, here is our documentation about that https://wpdatatables.com/documentation/table-features/using-placeholders/);

- The user_ID filter is still visible, which means, if someone changes/deletes this value, they could see the whole table.

We will hide it from the front-end with some custom CSS added in the "Customize" section of the main table settings.

- It should be easy to do, depending on your knowledge of HTML and CSS.

You have to find the correct selector using the browser inspector tool, add the style "display:none" property to it, and it will disappear from the front-end.

On our example table, the custom CSS is :

#table_1_5_filter_sections  {
    display:none; }

- Now, the user_ID filter is gone from the front-end.

- Optionally, you can hide the user_id column from the front-end, if needed, either using the column settings tab or the "column list" button from the back end Admin area.

- If you need more details about this, don't hesitate to contact us further.

Here you can see the full list of all available Placeholders for filtering;

Here you can see more about all Advanced Filters for Premium version;

And i just wanted to point out that you can try wpDataTables before purchasing

 on our sandbox Demo sites ( you can find links for the main plugin Demo,  

as well as add-on Demos, in my signature),

and there is a 15-day money-back guarantee period, 

so if you purchase the plugin, you can safely fully test it out, and if it doesn't fit your needs you can request and receive a refund in that period. ( same goes for all plugins and add-ons)

Let me know if you have any additional questions.