Problem in converting nested XML to JSON using JavaScript in-built library or recursive function

Hello everyone, 

I am trying to convert XML (Multilevel and contains some repetition of the node at same level) to JSON. I tried various methods from online and build recursive functions as well but did not work for me. 

I am looking for a way for in-built library which I can use into TestComplete (using npm install or using import), but I am not sure about such functionality in TestComplete.

If you face this kind of problem before and have an idea, then please share it to me.

It would be very helpful to me.

Thanks