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diff --git a/cpp/src/util/json.h b/cpp/src/util/json.h
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+// Copyright (C) 2013 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef I18N_ADDRESSINPUT_UTIL_JSON_H_
+#define I18N_ADDRESSINPUT_UTIL_JSON_H_
+
+#include <libaddressinput/util/basictypes.h>
+#include <libaddressinput/util/scoped_ptr.h>
+
+#include <string>
+#include <vector>
+
+namespace i18n {
+namespace addressinput {
+
+// Parses a JSON dictionary of strings. Sample usage:
+//    Json json;
+//    if (json.ParseObject("{'key1':'value1', 'key2':'value2'}") &&
+//        json.HasStringKey("key1")) {
+//      Process(json.GetStringValueForKey("key1"));
+//    }
+class Json {
+ public:
+  Json();
+  ~Json();
+
+  // Parses the |json| string and returns true if |json| is valid and it is an
+  // object.
+  bool ParseObject(const std::string& json);
+
+  // Returns the list of keys in the parsed JSON. The JSON object must be parsed
+  // successfully in ParseObject() before invoking this method.
+  const std::vector<std::string>& GetKeys() const;
+
+  // Returns true if the parsed JSON contains a string value for |key|. The JSON
+  // object must be parsed successfully in ParseObject() before invoking this
+  // method.
+  bool HasStringValueForKey(const std::string& key) const;
+
+  // Returns the string value for the |key|. The |key| must be present and its
+  // value must be of string type, i.e., HasStringValueForKey(key) must return
+  // true before invoking this method.
+  std::string GetStringValueForKey(const std::string& key) const;
+
+  // Returns true if the parsed JSON contains a dictionary value for |key|. The
+  // JSON object must be parsed successfully in ParseObject() before invoking
+  // this method.
+  bool HasDictionaryValueForKey(const std::string& key) const;
+
+  // Returns the dictionary value for the |key|. The |key| must be present and
+  // its value must be of the dictionary type, i.e., HasDictionaryValueForKey()
+  // must return true before invoking this method.
+  const Json& GetDictionaryValueForKey(const std::string& key) const;
+
+ private:
+  class JsonImpl;
+  scoped_ptr<JsonImpl> impl_;
+
+  DISALLOW_COPY_AND_ASSIGN(Json);
+};
+
+}  // namespace addressinput
+}  // namespace i18n
+
+#endif  // I18N_ADDRESSINPUT_UTIL_JSON_H_