Hi @Carrie_Liken - I would assume that the red underlining means that the brackets are in excess (e.g. are not “closing” any JSON object) and should be deleted or reviewed to make sure they align to a top level JSON object.
One trick you can leverage to understand the opening and closing of brackets in JSON is to click on the bottom bracket. It will highlight the top level bracket within the bracket pair so that you can be confident in your syntax:
In the example above, I clicked on the bottom bracket in line 196, so I know that my synonym object is closed out with line 189 and therefore the red-underlined bracket on line 197 should be deleted.