diff --git a/const.hpp b/const.hpp
index 40ffc62..e72abff 100644
--- a/const.hpp
+++ b/const.hpp
@@ -69,6 +69,18 @@
 constexpr auto kwdVpdInf = "com.ibm.ipzvpd.VINI";
 constexpr auto memVpdInf = "com.ibm.ipzvpd.VINI";
 constexpr auto ipzVpdInf = "com.ibm.ipzvpd.";
+constexpr auto offsetJsonDirectory = "/var/lib/vpd/";
+constexpr auto mapperObjectPath = "/xyz/openbmc_project/object_mapper";
+constexpr auto mapperInterface = "xyz.openbmc_project.ObjectMapper";
+constexpr auto mapperDestination = "xyz.openbmc_project.ObjectMapper";
+constexpr auto loggerObjectPath = "/xyz/openbmc_project/logging";
+constexpr auto loggerCreateInterface = "xyz.openbmc_project.Logging.Create";
+constexpr auto errIntfForBlankSystemVPD = "com.ibm.VPD.Error.BlankSystemVPD";
+constexpr auto errIntfForInvalidVPD = "com.ibm.VPD.Error.InvalidVPD";
+constexpr auto errIntfForStreamFail = "com.ibm.VPD.Error.InavlidEepromPath";
+constexpr auto errIntfForEccCheckFail = "com.ibm.VPD.Error.EccCheckFailed";
+constexpr auto errIntfForJsonFailure = "com.ibm.VPD.Error.InvalidJson";
+constexpr auto errIntfForBusFailure = "com.ibm.VPD.Error.DbusFailure";
 
 namespace lengths
 {