Editor tool for config.json

Hi Amit Kumar 
As John said, there is no custom tool just for editing the config file.

However, besides MPT you can also build msix packages with other tools, some of these tools like ours (Advanced Installer) have a dedicated GUI that abstracts the json file and allows you to configure it without requiring a deep knowledge of its format. Check the video in the demo.

We would love your feedback, this is a relatively new functionality that is evolving a lot.