pretty-print-json | 🦋 Pretty-print JSON data | JSON Processing library

I am well aware of the existence of JSON.parse and JSON.stringify and prettier the npm package. But for some reason I still have to do this by hand. Think of it as a coding interview question and please do not close this question simply because I could have used JSON.parse and JSON.stringify, as I said there is this constraint. And this question is NOT a duplicate of this pretty-print JSON using JavaScript

Here is a string "['foo', {bar:['baz',null,1.0,2]}]"

I wanted to implement a function to return a string denoting a json object with proper indentaion.

i.e. the output string should be

I want to show the data in tooltip in json format as attached in the pic.

I am able to load the data in tooltip(but not the way it is formatted in the picture attached).