Discoverable Json essentially flattens your JSON data (however nested) into valid javascript expressions. With absolute javascript paths, you can easily search for the sliver of data you care about. Or, remove the data that are not relevant to you.
Power JSON Editor is a JSON editor for developers with Visual Tree View and multiple plugins like Array Table Editor and jq Processor, also with format converter plugins, it is easy to convert files between JSON, PLIST, YAML and TOML.