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Unity 5.3, released quite a while back, supports JSON out of the box. Learn how to load a file, read the contents, parse the JSON, and map it to an object in our game.
Also, converting objects back into to JSON so you can save them back out.
JSONUtility Scripting Reference:
https://docs.unity3d.com/ScriptRefere...
Get Unity:
https://unity3d.com/
What the heck is JSON?
http://www.json.org/
Bang bang.