diff --git a/doorlockd/CMakeLists.txt b/doorlockd/CMakeLists.txt
index 0a5065d..8afed37 100644
--- a/doorlockd/CMakeLists.txt
+++ b/doorlockd/CMakeLists.txt
@@ -30,6 +30,7 @@ main.cpp
 logger.cpp
 door.cpp
 logic.cpp
+response.cpp
 util.cpp
 daemon.cpp
 )
diff --git a/doorlockd/response.cpp b/doorlockd/response.cpp
new file mode 100644
index 0000000..ab54fe9
--- /dev/null
+++ b/doorlockd/response.cpp
@@ -0,0 +1,22 @@
+#include <json/json.h>
+
+#include "response.h"
+
+const std::string Response::_codeKey = "code";
+const std::string Response::_messageKey = "message";
+
+Response::operator bool() const
+{
+    return code == Response::Code::Success;
+}
+
+std::string Response::toJson() const
+{
+    Json::Value response;
+    Json::StyledWriter writer;
+
+    response[_codeKey] = code;
+    response[_messageKey] = message;
+
+    return writer.write(response);
+}
diff --git a/doorlockd/response.h b/doorlockd/response.h
new file mode 100644
index 0000000..bf3c421
--- /dev/null
+++ b/doorlockd/response.h
@@ -0,0 +1,44 @@
+#ifndef RESPONSE_H
+#define RESPONSE_H
+
+#include <string>
+
+struct Response
+{
+    enum Code {
+        Success = 0, // Request successful
+        Fail, // General non-specified error
+        AlreadyUnlocked, // Authentication successful, but door is already unlocked
+        AlreadyLocked, // Authentication successful, but door is already locked
+        NotJson, // Request is not a valid JSON object
+        JsonError, // Request is valid JSON, but does not contain necessary material
+        InvalidToken, // Request contains invalid token
+        InvalidCredentials, // Invalid LDAP credentials
+        InvalidIP, // IP check failure
+        UnknownAction, // Unknown action
+        LDAPInit, // Ldap initialization failed
+    } code;
+
+    std::string message;
+    std::string toJson() const;
+    operator bool() const;
+
+    Response() :
+        code(Fail),
+        message("General failure")
+    {
+    }
+
+    Response(Response::Code code, const std::string &message = "") :
+        code(code),
+        message(message)
+    {
+    }
+
+private:
+
+    const static std::string _codeKey;
+    const static std::string _messageKey;
+};
+
+#endif // RESPONSE_H