Convert JSON String to JSON Object and Parse all data

Processing Libraries
2

could you cut down your code to what is your question please?

possibly start with the content of your msg?
put it in a file and skip all the network things.
? is that correct ?

[
  {"value": "[[ 40.0, 20.0, 0.0 ], [ 20.0, 40.0, 0.0 ], [ 60.0, 40.0, 0.0 ]]"},
  {"value": "[[ 140.0, 120.0, 0.0 ], [ 220.0, 420.0, 0.0 ], [ 60.0, 410.0, 0.0 ]]"},
  {"value": "[[ 10.0, 20.0, 0.0 ], [ 300.0, 220.0, 0.0 ], [ 40.0, 340.0, 0.0 ], [ 92.0, 20.0, 0.0 ]]"}
]

and the problem you might have is,
that inside are JSONObjects “value” what are string and not JSONArrays
the " [[],[]]" there should actually be no “”

_ OR ________________

JSONArray vectors, value,segments;
JSONObject vector;
String valuearrays;

String filename="data/vectors.json";

void setup() {
  vectors = loadJSONArray(filename);
  println(vectors);
  for (int i = 0; i < vectors.size(); i++) {
    vector = vectors.getJSONObject(i);
    println("i "+i+"_"+vector);
    valuearrays = vector.getString("value");
    //println(valuearrays);
    value = JSONArray.parse(valuearrays);
    //println(value);   
    for (int j = 0; j < value.size(); j++) {
      segments=value.getJSONArray(j);
      println("i "+i+" j "+j+"_"+segments);
    }
  }
}
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