I recently did this manually by piping responses to a temp file called before and after, and then using vimdiff as my differ which proved quite effective.

This tool looks great, but would not have worked with my particular use case, which was doing some migration of user data, and diffing the user accounts to make sure that they had changed in the expected way.

It might be an idea to add the ability to query the same host twice, but have a user input trigger when to test each host.