JAVA - json parser - keys() to parse unknown json format?

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I try to parse a simple json dictionary, so I read many tutorials and threads on how to achieve this

but there is no "keys()" nor "keySet()" defined for JSONObject nor JSONArray

I downloaded the library here :

I am starting to wonder if I use the right library

here is my code :

import org.json.simple.parser.ParseException;
import org.json.simple.parser.JSONParser;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;

JSONParser parser = new JSONParser();
JSONObject obj = (JSONObject)parser.parse(json.trim());
Iterator keys = obj.keys(); <<<<<<<<<<<<<<<<<<<<<<<<<<<< keys() undefined
while(keys.hasNext()) {
    String key =;

json example :


any help appreciated


You can try this:

JSONObject jsonArray = ...//get json object

Iterator<?> keys = jsonArray.keys();

while( keys.hasNext() ) {
    String key = (String);
    System.out.println("Value: " + jsonArray.get(key));
    System.out.println("Key: " + key);

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I think keySet().iterator() is, what you need:

    JSONParser parser = new JSONParser();
    JSONObject obj = (JSONObject)parser.parse(json.trim());
    Iterator keys = obj.keySet().iterator();
    while(keys.hasNext()) {
        String key = (String);

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