diff --git a/arkoala/framework/native/src/generated/arkoala_api_generated.h b/arkoala/framework/native/src/generated/arkoala_api_generated.h
index bfb132d274fcfb23f2b36d84ba3fc5890c91351b..711c23251941f211ab7cdb2b735ccc42b07e7a10 100644
--- a/arkoala/framework/native/src/generated/arkoala_api_generated.h
+++ b/arkoala/framework/native/src/generated/arkoala_api_generated.h
@@ -58,6 +58,7 @@ typedef double InteropFloat64;
 typedef int32_t InteropInt32;
 typedef unsigned int InteropUInt32; // TODO: update unsigned int
 typedef int64_t InteropInt64;
+typedef uint64_t InteropUInt64;
 typedef int8_t InteropInt8;
 typedef uint8_t InteropUInt8;
 typedef int64_t InteropDate;
diff --git a/interop/src/cpp/DeserializerBase.h b/interop/src/cpp/DeserializerBase.h
index 87fe3fc392bb6d037735247552eabcfecebf361e..16d49ffe7d284989ea8feabae4ff0c2b1b6db8ef 100644
--- a/interop/src/cpp/DeserializerBase.h
+++ b/interop/src/cpp/DeserializerBase.h
@@ -412,6 +412,18 @@ public:
     memcpy(&value, data + position, 4);
 #else
     auto value = *(InteropInt64 *)(data + position);
+#endif
+    position += 8;
+    return value;
+  }
+  InteropUInt64 readUInt64()
+  {
+    check(8);
+#ifdef KOALA_NO_UNALIGNED_ACCESS
+    InteropInt64 value;
+    memcpy(&value, data + position, 4);
+#else
+    auto value = *(InteropUInt64 *)(data + position);
 #endif
     position += 8;
     return value;
diff --git a/interop/src/cpp/SerializerBase.h b/interop/src/cpp/SerializerBase.h
index 8d638146613b76db7f99a404bfd6fd7c87019801..d631a0a2ad959aaf1f7ca7ae1106a5db34d856ce 100644
--- a/interop/src/cpp/SerializerBase.h
+++ b/interop/src/cpp/SerializerBase.h
@@ -140,6 +140,16 @@ public:
         position += 8;
     }
 
+    void writeUInt64(InteropUInt64 value) {
+        check(8);
+#ifdef KOALA_NO_UNALIGNED_ACCESS
+        memcpy(data + position, &value, 8);
+#else
+        *((InteropUInt64*)(data + position)) = value;
+#endif
+        position += 8;
+    }
+
     void writeFloat32(InteropFloat32 value) {
         check(8);
 #ifdef KOALA_NO_UNALIGNED_ACCESS
diff --git a/interop/src/cpp/interop-types.h b/interop/src/cpp/interop-types.h
index b27e3dc18e080fb3032d93cdcbf9ca05e05746f3..6c23272a457ccc737701229da9c0fc865a1dc1a6 100644
--- a/interop/src/cpp/interop-types.h
+++ b/interop/src/cpp/interop-types.h
@@ -35,6 +35,7 @@ typedef double InteropFloat64;
 typedef int32_t InteropInt32;
 typedef unsigned int InteropUInt32; // TODO: update unsigned int
 typedef int64_t InteropInt64;
+typedef uint64_t InteropUInt64;
 typedef int8_t InteropInt8;
 typedef uint8_t InteropUInt8;
 typedef int64_t InteropDate;
diff --git a/interop/src/cpp/napi/convertors-napi.cc b/interop/src/cpp/napi/convertors-napi.cc
index 725853dd5faac31a66701cd7d9b19e5c1b7b3f26..7fa237507d1856f7b851ffd9c156d77f81c4e3fe 100644
--- a/interop/src/cpp/napi/convertors-napi.cc
+++ b/interop/src/cpp/napi/convertors-napi.cc
@@ -12,6 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+#include <cstdint>
 #include <cstring>
 #include <vector>
 #include <string>
@@ -152,17 +153,21 @@ KLong getInt64(napi_env env, napi_value value) {
     return static_cast<KLong>(ptr64);
 }
 
-// napi_value getObject(napi_env env, napi_value value) {
-//     if (getValueTypeChecked(env, value) != napi_valuetype::napi_object) {
-//         Napi::Error::New(env, "Expected Object")
-//           .ThrowAsJavaScriptException();
-//         napi_value result;
-//         napi_status status = napi_get_global(env, &result);
-//         KOALA_NAPI_THROW_IF_FAILED(env, status, result);
-//     }
+KULong getUInt64(napi_env env, napi_value value) {
+    if (getValueTypeChecked(env, value) != napi_valuetype::napi_bigint) {
+        napi_throw_error(env, nullptr, "cannot be coerced to uint64");
+        return -1;
+    }
 
-//     return value;
-// }
+    bool isWithinRange = true;
+    uint64_t ptr64 = 0;
+    napi_get_value_bigint_uint64(env, value, &ptr64, &isWithinRange);
+    if (!isWithinRange) {
+        napi_throw_error(env, nullptr, "cannot be coerced to uint64, value is too large");
+        return -1;
+    }
+    return static_cast<KLong>(ptr64);
+}
 
 napi_value makeString(napi_env env, const KStringPtr& value) {
     napi_value result;
@@ -204,6 +209,22 @@ napi_value makeUInt32(napi_env env, uint32_t value) {
     return result;
 }
 
+napi_value makeInt64(napi_env env, int64_t value) {
+    napi_value result;
+    napi_status status;
+    status = napi_create_bigint_int64(env, value, &result);
+    KOALA_NAPI_THROW_IF_FAILED(env, status, result);
+    return result;
+}
+
+napi_value makeUInt64(napi_env env, uint64_t value) {
+    napi_value result;
+    napi_status status;
+    status = napi_create_bigint_uint64(env, value, &result);
+    KOALA_NAPI_THROW_IF_FAILED(env, status, result);
+    return result;
+}
+
 napi_value makeFloat32(napi_env env, float value) {
     napi_value result;
     napi_status status;
diff --git a/interop/src/cpp/napi/convertors-napi.h b/interop/src/cpp/napi/convertors-napi.h
index aa4354c3c76503fa1e5e3b3abc5f7f84bf52921f..29adb12654b5845aac16c86837db2881c16d7fbc 100644
--- a/interop/src/cpp/napi/convertors-napi.h
+++ b/interop/src/cpp/napi/convertors-napi.h
@@ -393,6 +393,11 @@ inline void* getPointer(const CallbackInfo& info, int index) {
     NAPI_ASSERT_INDEX(info, index, nullptr);
     return getPointer(info.Env(), info[index]);
 }
+KULong getUInt64(napi_env env, napi_value value);
+inline KULong getUInt64(const CallbackInfo& info, int index) {
+    NAPI_ASSERT_INDEX(info, index, 0);
+    return getUInt64(info.Env(), info[index]);
+}
 KLong getInt64(napi_env env, napi_value value);
 inline KLong getInt64(const CallbackInfo& info, int index) {
     NAPI_ASSERT_INDEX(info, index, 0);
@@ -503,6 +508,11 @@ inline KLong getArgument<KLong>(const CallbackInfo& info, int index) {
   return getInt64(info, index);
 }
 
+template <>
+inline KULong getArgument<KULong>(const CallbackInfo& info, int index) {
+  return getUInt64(info, index);
+}
+
 template <>
 inline KNativePointerArray getArgument<KNativePointerArray>(const CallbackInfo& info, int index) {
   return getPointerElements(info, index);
@@ -563,6 +573,8 @@ napi_value makeString(napi_env env, const std::string& value);
 napi_value makeBoolean(napi_env env, KBoolean value);
 napi_value makeInt32(napi_env env, int32_t value);
 napi_value makeUInt32(napi_env env, uint32_t value);
+napi_value makeInt64(napi_env env, int32_t value);
+napi_value makeUInt64(napi_env env, uint32_t value);
 napi_value makeFloat32(napi_env env, float value);
 napi_value makePointer(napi_env env, void* value);
 napi_value makeVoid(napi_env env);
@@ -590,6 +602,16 @@ inline napi_value makeResult<uint32_t>(const CallbackInfo& info, uint32_t value)
   return makeUInt32(info.Env(), value);
 }
 
+template <>
+inline napi_value makeResult<KLong>(const CallbackInfo& info, int64_t value) {
+  return makeInt64(info.Env(), value);
+}
+
+template <>
+inline napi_value makeResult<KULong>(const CallbackInfo& info, uint64_t value) {
+  return makeUInt64(info.Env(), value);
+}
+
 template <>
 inline napi_value makeResult<float>(const CallbackInfo& info, float value) {
   return makeFloat32(info.Env(), value);
@@ -600,16 +622,6 @@ inline napi_value makeResult<KNativePointer>(const CallbackInfo& info, KNativePo
   return makePointer(info.Env(), value);
 }
 
-// template <>
-// inline napi_value makeResult<napi_value>(const CallbackInfo& info, napi_value value) {
-//   return value;
-// }
-
-// template <>
-// inline napi_value makeResult<napi_value>(const CallbackInfo& info, napi_value value) {
-//   return makeObject(info, value);
-// }
-
 template <>
 inline napi_value makeResult<KVMObjectHandle>(const CallbackInfo& info, KVMObjectHandle value) {
   return InteropTypeConverter<KVMObjectHandle>::convertTo(info.Env(), value);
diff --git a/interop/src/cpp/types/koala-types.h b/interop/src/cpp/types/koala-types.h
index 8b0e86f8a91e0a0c17266633ca3a200810f497df..44beaceeec7b9f977fec3862ca12ca86b8f0cbd9 100644
--- a/interop/src/cpp/types/koala-types.h
+++ b/interop/src/cpp/types/koala-types.h
@@ -124,6 +124,7 @@ typedef int32_t KInt;
 typedef uint32_t KUInt;
 typedef float KFloat;
 typedef int64_t KLong;
+typedef uint64_t KULong;
 typedef double KDouble;
 typedef void* KNativePointer;
 typedef KStringPtrImpl KStringPtr;