loadJSONArray() / Reference

// The following short JSON file called "data.json" is parsed 
// in the code below. It must be in the project's "data" folder.

/*
[
  {
    "id": 0,
    "species": "Capra hircus",
    "name": "Goat"
  },
  {
    "id": 1,
    "species": "Panthera pardus",
    "name": "Leopard"
  },
  {
    "id": 2,
    "species": "Equus zebra",
    "name": "Zebra"
  }
]
*/

JSONArray values;

void setup() {

  values = loadJSONArray("data.json");

  for (int i = 0; i < values.size(); i++) {
    
    JSONObject animal = values.getJSONObject(i); 

    int id = animal.getInt("id");
    String species = animal.getString("species");
    String name = animal.getString("name");

    println(id + ", " + species + ", " + name);
  }
}

// Sketch prints:
// 0, Capra hircus, Goat
// 1, Panthera pardus, Leopard
// 2, Equus zebra, Zebra