JavaScriptUtils | Utility functions written in Javascript | Date Time Utils library

I use map everywhere in my project, even when i don't want to return anything, i simply use {} instead of () and don't return anything and simply use it like a for loop, is this okay? and if it is, what about not using any key ?, because i sometimes don't really work with elements inside the map, i don't even need to (or know how) to use key for it!
Here is an example which i copied from my code:

I am building a web application using Spring MVC. The application involves fetching multiple objects containing strings as attributes from the Database. I have no control over the format of these strings entered into the Database.

I ran into a problem where when strings having quotes in them(" and ') are passed into JavaScript as the attributes of JSON Objects, they are not recognized as part of the string, and hence they close the quotes of the string they were part of. I solved this issue by calling the JavaScriptUtils.javaScriptEscape() function on every string fetched from the database in a wrapper function.

This fixes the JavaScript errors, but now I have the problem that when the same strings displayed on the webpage, the escape character '\' is included(i.e " displayed as \" etc). My requirements now are the following:

1. Need a function to 'unescape' these strings back to normal form so they work as intended

2. Need a way to apply said function to all the strings fetched into the front end. It is too much of a pain to individually call this function to each attribute of each JSON object fetched in each AJAX call. As more features will be added to the application in the future, the solution should preferably be one that does not require to be hardcoded into every AJAX request.

3. Need a better way to apply this escaping to the objects fetched from database. Right now, I am having a separate function which Escapes the strings in each object, but the problem with this is that I will need to define a new function every time a new type of object is fetched.

I wonder whether there is a way to make Spring MVC automatically deal with this, as it seems to be an issue most developers would face at some point. Any suggestions that will help make this easier for me are appreciated!

EDIT:

This is the function which is called on every string fetched from the database: