Java Utililty Methods Json Convert

List jsonArrayToBooleanList(final JsonArray arr)
Convert a json array to a list of booleans.

final List<Boolean> out = new ArrayList<>();
if (arr == null)
 return out;
for (int i = 0; i < arr.size(); i++) {
 final Boolean b = arr.getBoolean(i);
 if (b == null) {
 throw new ClassCastException(
 "Element at position " + String.valueOf(i) + " is null - Boolean required");
...

String jsonArrayToString(final JsonArray array)
Parse a JsonArray into String

final StringBuilder builder = new StringBuilder("[");
final Iterator<JsonValue> iterator = array.iterator();
while (iterator.hasNext()) {
 final JsonValue current = iterator.next();
 if (!builder.toString().equalsIgnoreCase("[")) {
 builder.append(',');
 builder.append(jsonValueToJsonString(current, null));
...

int[] toIntArray(JsonArray jsonArray)
to Int Array

if (jsonArray == null)
 return new int[0];
int[] ret = new int[jsonArray.size()];
for (int i = 0; i < jsonArray.size(); i++) {
 ret[i] = ((JsonNumber) jsonArray.get(i)).intValue();
return ret;

String toJsonString(JsonObject json)
Returns a string representation of a json object, or null if json object is null.

return json != null ? json.toString() : null;

List toList(JsonArray array)
to List

List<Object> list = new ArrayList<Object>();
for (int i = 0; i < array.size(); i++) {
 Object value = array.get(i);
 if (value instanceof JsonArray) {
 value = toList((JsonArray) value);
 } else if (value instanceof JsonObject) {
 value = toMap((JsonObject) value);
 list.add(value);
return list;

String toString(JsonValue json)
Converts a JSON value to an indented text representation.

StringBuilder sb = new StringBuilder();
toString(json, sb, 0);
return sb.toString();

String[] toStringArray(JsonArray jsa)
Convert a JsonArray to a String array.

ArrayList<String> list = new ArrayList<String>();
for (JsonValue v : jsa) {
 if ((v != null) && v.getValueType().equals(ValueType.STRING)) {
 list.add(((JsonString) v).getString());
return list.toArray(new String[0]);