diff --git a/shared/nm-glib-aux/nm-jansson.h b/shared/nm-glib-aux/nm-jansson.h
index dbf9f8b43..a8ce3e5b0 100644
--- a/shared/nm-glib-aux/nm-jansson.h
+++ b/shared/nm-glib-aux/nm-jansson.h
@@ -116,6 +116,34 @@ nm_jansson_json_as_string (const json_t *elem,
 	return 1;
 }
 
+/*****************************************************************************/
+
+#ifdef NM_VALUE_TYPE_DEFINE_FUNCTIONS
+#include "nm-value-type.h"
+static inline gboolean
+nm_value_type_from_json (NMValueType value_type,
+                         const json_t *elem,
+                         gpointer out_val)
+{
+	switch (value_type) {
+	case NM_VALUE_TYPE_BOOL:   return (nm_jansson_json_as_bool   (elem, out_val) > 0);
+	case NM_VALUE_TYPE_INT32:  return (nm_jansson_json_as_int32  (elem, out_val) > 0);
+	case NM_VALUE_TYPE_INT:    return (nm_jansson_json_as_int    (elem, out_val) > 0);
+
+	/* warning: this overwrites/leaks the previous value. You better have *out_val
+	 * point to uninitialized memory or NULL. */
+	case NM_VALUE_TYPE_STRING: return (nm_jansson_json_as_string (elem, out_val) > 0);
+
+	case NM_VALUE_TYPE_UNSPEC:
+		break;
+	}
+	nm_assert_not_reached ();
+	return FALSE;
+}
+#endif
+
+/*****************************************************************************/
+
 #endif /* WITH_JANSON */
 
 #endif  /* __NM_JANSSON_H__ */
diff --git a/shared/nm-glib-aux/nm-json-aux.h b/shared/nm-glib-aux/nm-json-aux.h
index 8d6c2c4f4..19d43ce4f 100644
--- a/shared/nm-glib-aux/nm-json-aux.h
+++ b/shared/nm-glib-aux/nm-json-aux.h
@@ -56,4 +56,28 @@ void nm_json_aux_gstr_append_obj_name (GString *gstr,
 
 /*****************************************************************************/
 
+#ifdef NM_VALUE_TYPE_DEFINE_FUNCTIONS
+#include "nm-value-type.h"
+static inline void
+nm_value_type_to_json (NMValueType value_type,
+                       GString *gstr,
+                       gconstpointer p_field)
+{
+	nm_assert (p_field);
+	nm_assert (gstr);
+
+	switch (value_type) {
+	case NM_VALUE_TYPE_BOOL:   nm_json_aux_gstr_append_bool   (gstr, *((const bool        *) p_field)); return;
+	case NM_VALUE_TYPE_INT32:  nm_json_aux_gstr_append_int64  (gstr, *((const gint32      *) p_field)); return;
+	case NM_VALUE_TYPE_INT:    nm_json_aux_gstr_append_int64  (gstr, *((const int         *) p_field)); return;
+	case NM_VALUE_TYPE_STRING: nm_json_aux_gstr_append_string (gstr, *((const char *const *) p_field)); return;
+	case NM_VALUE_TYPE_UNSPEC:
+		break;
+	}
+	nm_assert_not_reached ();
+}
+#endif
+
+/*****************************************************************************/
+
 #endif  /* __NM_JSON_AUX_H__ */