you can try this online JSON tool https://www.jsonformatting.com/

I use JSON Formatter and JSON Viewer

Sublime Text is a decent manager for doing as such.

Or, on the other hand you can go encourage by utilizing JSONMate editor.

19216811wiki.com

I really like this:

http://jsoneditoronline.org/

My go-to tool for validating and automatic reformatting of JSON is https://jsonformatter.curiousconcept.com/

Try this online JSON Viewer/editor/formatter/validator http://jsonviewer.stack.hu/