I don’t like the JSON editor compared to lets say Postman. It’s clunky, and not nice to write in. At the very least the edit screen should be wider. I cannot even scroll to the right or manually widen the popup…
Also the alignment / hierarchy view would be required, something like this:
And also when you click on the beginning of array or object, it should highlight the end of the array/object too. Add colors. Add a beautify button. Etc etc