diff --git a/tools/nfdc/canonizer.hpp b/tools/nfdc/canonizer.hpp
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+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2020,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef NFD_TOOLS_NFDC_CANONIZER_HPP
+#define NFD_TOOLS_NFDC_CANONIZER_HPP
+
+#include "core/common.hpp"
+#include "execute-command.hpp"
+#include "find-face.hpp"
+
+#include <ndn-cxx/net/face-uri.hpp>
+
+namespace nfd {
+namespace tools {
+namespace nfdc {
+
+/** \brief canonize FaceUri
+ *  \return pair of canonical FaceUri (nullopt if failure) and error string
+ */
+std::pair<optional<FaceUri>, std::string>
+canonize(ExecuteContext& ctx, const FaceUri& uri);
+
+/** \brief helper to generate exit code and error message for face canonization failures
+ *  \param uri FaceUri
+ *  \param error error string returned by canonization process
+ *  \param field optional field identifier to include with message
+ *  \return pair of exit code and error message
+ */
+std::pair<FindFace::Code, std::string>
+canonizeErrorHelper(const FaceUri& uri,
+                    const std::string& error,
+                    const std::string& field = "");
+
+} // namespace nfdc
+} // namespace tools
+} // namespace nfd
+
+#endif // NFD_TOOLS_NFDC_CANONIZER_HPP