Java GSON: Getting the list of all keys under a JSONObject

Question

I have got GSON as a JSON parser in Java, but the keys aren\'t always the same.
For example. I have the following JSON:

{ \"The Object I already

Answer 1

String str = "{\"key1\":\"val1\", \"key2\":\"val2\"}";

        JsonParser parser = new JsonParser();
        JsonObject jObj = (JsonObject)parser.parse(str);

        List<String> keys = new ArrayList<String>();
        for (Entry<String, JsonElement> e : jObj.entrySet()) {
            keys.add(e.getKey());
        }

        // keys contains jsonObject's keys

Answer 2

Since Java 8 you can use Streams as better looking alternative:

String str = "{\"key1\":\"val1\", \"key2\":\"val2\"}";

JsonParser parser = new JsonParser();
JsonObject jObj = (JsonObject) parser.parse(str);

List<String> keys = jObj.entrySet()
    .stream()
    .map(i -> i.getKey())
    .collect(Collectors.toCollection(ArrayList::new));

keys.forEach(System.out::println);

Answer 3

As of Gson 2.8.1 you can use keySet():

String json = "{\"key1\":\"val\", \"key2\":\"val\"}";

JsonParser parser = new JsonParser();
JsonObject jsonObject = parser.parse(json).getAsJsonObject();

Set<String> keys = jsonObject.keySet();

Answer 4

You can use JsonParser to convert your Json into an intermediate structure which allow you to examine the json content.

String yourJson = "{your json here}";
JsonElement element = JsonParser.parseString(yourJson);
JsonObject obj = element.getAsJsonObject(); //since you know it's a JsonObject
Set<Map.Entry<String, JsonElement>> entries = obj.entrySet();//will return members of your object
for (Map.Entry<String, JsonElement> entry: entries) {
    System.out.println(entry.getKey());
}