Java Utililty Methods Json Convert

List of utility methods to do Json Convert

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Description

The list of methods to do Json Convert are organized into topic(s).

Method

ListjsonArrayToBooleanList(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");
...
StringjsonArrayToString(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;
StringtoJsonString(JsonObject json)
Returns a string representation of a json object, or null if json object is null. 
return json != null ? json.toString() : null;
ListtoList(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;
StringtoString(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]);