Parse json file in cocos2dx

I am working on cocos2d-x project, I will be using my iOS and Android code. Now I am using a json file to store unlock data, but I don't know how to parse the data in cocos2dx. can i get a quick guide (demo code) so i can continue my project.

I created a json file and saved the data in it. I put the demo inside a json file.

{
  "id": "food",
  "name": "cherry",
  "price": "20 coins",
  "unlock": {
    "level": 15,
    "advance_unlock_price": "200 coins"
  }
}