diff --git a/src/JsonHelper.cc b/src/JsonHelper.cc
index e1c4058..b15220c 100644
--- a/src/JsonHelper.cc
+++ b/src/JsonHelper.cc
@@ -262,3 +262,25 @@ void JsonHelper::saveGeoCoordinateArray(const QList<QGeoCoordinate>&    rgPoints
     }
     return saveGeoCoordinateArray(rgVarPoints, writeAltitude, jsonValue);
 }
+
+bool JsonHelper::validateKeys(const QJsonObject& jsonObject, const QList<JsonHelper::KeyValidateInfo>& keyInfo, QString& errorString)
+{
+    QStringList             keyList;
+    QList<QJsonValue::Type> typeList;
+
+    for (int i=0; i<keyInfo.count(); i++) {
+        if (keyInfo[i].required) {
+            keyList.append(keyInfo[i].key);
+        }
+    }
+    if (!validateRequiredKeys(jsonObject, keyList, errorString)) {
+        return false;
+    }
+
+    keyList.clear();
+    for (int i=0; i<keyInfo.count(); i++) {
+        keyList.append(keyInfo[i].key);
+        typeList.append(keyInfo[i].type);
+    }
+    return validateKeyTypes(jsonObject, keyList, typeList, errorString);
+}
diff --git a/src/JsonHelper.h b/src/JsonHelper.h
index 12e7ccd..546e059 100644
--- a/src/JsonHelper.h
+++ b/src/JsonHelper.h
@@ -37,6 +37,14 @@ public:
     static bool validateRequiredKeys(const QJsonObject& jsonObject, const QStringList& keys, QString& errorString);
     static bool validateKeyTypes(const QJsonObject& jsonObject, const QStringList& keys, const QList<QJsonValue::Type>& types, QString& errorString);
 
+    typedef struct {
+        const char*         key;        ///< json key name
+        QJsonValue::Type    type;       ///< type of key
+        bool                required;   ///< true: key must be present
+    } KeyValidateInfo;
+
+    static bool validateKeys(const QJsonObject& jsonObject, const QList<KeyValidateInfo>& keyInfo, QString& errorString);
+
     /// Loads a QGeoCoordinate
     /// @return false: validation failed
     static bool loadGeoCoordinate(const QJsonValue& jsonValue,          ///< json value to load from