Items can be saved to JSON file "items.json" (in standard location).

data/filehandler.h

@@ -0,0 +1,15 @@
+#ifndef FILEHANDLER_H
+#define FILEHANDLER_H
+
+class QJsonDocument;
+class QString;
+
+class FileHandler {
+ public:
+  static bool saveToFile(const QJsonDocument& doc, const QString& fileName);
+
+ private:
+  explicit FileHandler();
+};
+
+#endif  // FILEHANDLER_H