Gets the job done
This isnt a perfect JSON editor, but it gets the job done. It is better than the other two editors I tried. It handles large documents well and lets you edit the JSON one object at a time. Support for duplication and cut and paste at the object level is also nice - no lining up brackets!
If you find yourself in an unfortunate situation where you need to edit JSON by hand, this is the best alternative Ive found.
Some dude tyttttthui about
Power JSON Editor