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by bombtrack 4394 days ago
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.

Otherwise, there's always sites like http://pro.jsonlint.com/