This is OT, trivial and a bit silly: How did you intend the json file? I tried with sublime but couldn't find anything to solve it. Didn't start an IDE for this.
There's several JSON formatter packages that can be installed via Package Control: cmd + shift + P, select "install package", then search for "json". I'm not sure which one I have installed, but doing cmd + shift + P in a proper context and typing "json" should give you an option for "Indent JSON" or similar.