diff --git a/ydb/core/fq/libs/row_dispatcher/json_parser.cpp b/ydb/core/fq/libs/row_dispatcher/json_parser.cpp
index 2c3a3d38f024..84ca3018b509 100644
--- a/ydb/core/fq/libs/row_dispatcher/json_parser.cpp
+++ b/ydb/core/fq/libs/row_dispatcher/json_parser.cpp
@@ -230,8 +230,9 @@ class TJsonParser::TImpl {
 public:
     TImpl(
         const TVector<TString>& columns,
+        const TVector<TString>& types,
         TCallback callback)
-        : Sql(GenerateSql(columns)) {
+        : Sql(GenerateSql(columns, types)) {
         auto options = NYql::NPureCalc::TProgramFactoryOptions();
         auto factory = NYql::NPureCalc::MakeProgramFactory(options);
 
@@ -240,7 +241,7 @@ class TJsonParser::TImpl {
             TParserInputSpec(),
             TParserOutputSpec(MakeOutputSchema(columns)),
             Sql,
-            NYql::NPureCalc::ETranslationMode::SQL
+            NYql::NPureCalc::ETranslationMode::SExpr
         );
         LOG_ROW_DISPATCHER_DEBUG("Program created");
         InputConsumer = Program->Apply(MakeHolder<TParserOutputConsumer>(callback));
@@ -257,19 +258,51 @@ class TJsonParser::TImpl {
     }
 
 private:
-    TString GenerateSql(const TVector<TString>& columns) {
-        TStringStream str;
-        str << "$json = SELECT CAST(data AS Json) as `Json`, " << OffsetFieldName << " FROM Input;"; 
-        str << "\nSELECT " << OffsetFieldName << ", ";
-        for (auto it = columns.begin(); it != columns.end(); ++it) {
-            str << R"(CAST(Unwrap(JSON_VALUE(`Json`, "$.)" << *it << "\")) as String) as "
-                << *it << ((it != columns.end() - 1) ? "," : "");
+    TString GenerateSql(const TVector<TString>& columnNames, const TVector<TString>& columnTypes) {
+        Y_ABORT_UNLESS(columnNames.size() == columnTypes.size(), "Unexpected column types size");
+
+        TStringStream udfOutputType;
+        TStringStream resultType;
+        for (size_t i = 0; i < columnNames.size(); ++i) {
+            const TString& lastSymbol = i + 1 == columnNames.size() ? "" : " ";
+            const TString& column = columnNames[i];
+            const TString& type = SkipOptional(columnTypes[i]);
+
+            udfOutputType << "'('" << column << " (DataType '" << type << "))" << lastSymbol;
+            resultType << "'('" << column << " (SafeCast (Member $parsed '" << column << ") $string_type))" << lastSymbol;
         }
-        str << " FROM $json;";
+
+        TStringStream str;
+        str << R"(
+            (
+            (let $string_type (DataType 'String))
+
+            (let $input_type (TupleType $string_type (DataType 'Uint64)))
+            (let $output_type (TupleType (StructType )" << udfOutputType.Str() << R"() (DataType 'Uint64)))
+            (let $udf_argument_type (TupleType $input_type (StructType) $output_type))
+            (let $udf_callable_type (CallableType '('1) '((StreamType $output_type)) '((StreamType $input_type)) '((OptionalType (DataType 'Utf8)))))
+            (let $udf (Udf 'ClickHouseClient.ParseFormat (Void) $udf_argument_type 'json_each_row $udf_callable_type (VoidType) '"" '()))
+
+            (return (Map (Apply $udf (Map (Self '0) (lambda '($input) (block '(
+                (return '((Member $input 'data) (Member $input ')" << OffsetFieldName << R"()))
+            ))))) (lambda '($output) (block '(
+                (let $parsed (Nth $output '0))
+                (return (AsStruct '(')" << OffsetFieldName << R"( (Nth $output '1)) )" << resultType.Str() << R"())
+            )))))
+            )
+        )";
         LOG_ROW_DISPATCHER_DEBUG("GenerateSql " << str.Str());
         return str.Str();
     }
 
+    static TString SkipOptional(TStringBuf type) {
+        if (type.StartsWith("Optional")) {
+            Y_ABORT_UNLESS(type.SkipPrefix("Optional<"));
+            Y_ABORT_UNLESS(type.ChopSuffix(">"));
+        }
+        return TString(type);
+    }
+
 private:
     THolder<NYql::NPureCalc::TPushStreamProgram<TParserInputSpec, TParserOutputSpec>> Program;
     THolder<NYql::NPureCalc::IConsumer<TInputConsumerArg>> InputConsumer;
@@ -278,8 +311,9 @@ class TJsonParser::TImpl {
 
 TJsonParser::TJsonParser(
     const TVector<TString>& columns,
+    const TVector<TString>& types,
     TCallback callback)
-    : Impl(std::make_unique<TJsonParser::TImpl>(columns, callback)) { 
+    : Impl(std::make_unique<TJsonParser::TImpl>(columns, types, callback)) { 
 }
 
 TJsonParser::~TJsonParser() {
@@ -295,8 +329,9 @@ TString TJsonParser::GetSql() {
 
 std::unique_ptr<TJsonParser> NewJsonParser(
     const TVector<TString>& columns,
+    const TVector<TString>& types,
     TCallback callback) {
-    return std::unique_ptr<TJsonParser>(new TJsonParser(columns, callback));
+    return std::unique_ptr<TJsonParser>(new TJsonParser(columns, types, callback));
 }
 
 } // namespace NFq
diff --git a/ydb/core/fq/libs/row_dispatcher/json_parser.h b/ydb/core/fq/libs/row_dispatcher/json_parser.h
index d67761b401ce..cb5137105e6b 100644
--- a/ydb/core/fq/libs/row_dispatcher/json_parser.h
+++ b/ydb/core/fq/libs/row_dispatcher/json_parser.h
@@ -13,6 +13,7 @@ class TJsonParser {
 public:
     TJsonParser(
         const TVector<TString>& columns,
+        const TVector<TString>& types,
         TCallback callback);
     ~TJsonParser();
     void Push(ui64 offset, const TString& value);
@@ -25,6 +26,7 @@ class TJsonParser {
 
 std::unique_ptr<TJsonParser> NewJsonParser(
     const TVector<TString>& columns,
+    const TVector<TString>& types,
     TJsonParser::TCallback callback);
 
 } // namespace NFq
diff --git a/ydb/core/fq/libs/row_dispatcher/topic_session.cpp b/ydb/core/fq/libs/row_dispatcher/topic_session.cpp
index 2294f097a5fc..9623806ee87a 100644
--- a/ydb/core/fq/libs/row_dispatcher/topic_session.cpp
+++ b/ydb/core/fq/libs/row_dispatcher/topic_session.cpp
@@ -676,6 +676,7 @@ void TTopicSession::InitParser(const NYql::NPq::NProto::TDqPqTopicSource& source
         NActors::TActorSystem* actorSystem = NActors::TActivationContext::ActorSystem();
         Parser = NewJsonParser(
             GetVector(sourceParams.GetColumns()),
+            GetVector(sourceParams.GetColumnTypes()),
             [actorSystem, selfId = SelfId()](ui64 offset, TList<TString>&& value){
                 actorSystem->Send(selfId, new NFq::TEvPrivate::TEvDataParsed(offset, std::move(value)));
             });
diff --git a/ydb/core/fq/libs/row_dispatcher/ut/json_parser_ut.cpp b/ydb/core/fq/libs/row_dispatcher/ut/json_parser_ut.cpp
index 58f19a4ee262..a9c389d3900f 100644
--- a/ydb/core/fq/libs/row_dispatcher/ut/json_parser_ut.cpp
+++ b/ydb/core/fq/libs/row_dispatcher/ut/json_parser_ut.cpp
@@ -6,6 +6,9 @@
 #include <ydb/core/testlib/actors/test_runtime.h>
 #include <ydb/core/testlib/basics/helpers.h>
 #include <ydb/core/testlib/actor_helpers.h>
+
+#include <ydb/library/yql/public/purecalc/common/interface.h>
+
 #include <library/cpp/testing/unittest/registar.h>
 
 namespace {
@@ -31,10 +34,19 @@ class TFixture : public NUnitTest::TBaseFixture {
         }
     }
 
+    void MakeParser(TVector<TString> columns, TVector<TString> types, NFq::TJsonParser::TCallback callback) {
+        try {
+            Parser = NFq::NewJsonParser(
+                columns,
+                types,
+                callback);
+        } catch (NYql::NPureCalc::TCompileError compileError) {
+            UNIT_ASSERT_C(false, TStringBuilder() << "Failed to create json parser: " << compileError.what() << "\nQuery text:\n" << compileError.GetYql() << "Reason:\n" << compileError.GetIssues());
+        }
+    }
+
     void MakeParser(TVector<TString> columns, NFq::TJsonParser::TCallback callback) {
-        Parser = NFq::NewJsonParser(
-            columns,
-            callback);
+        MakeParser(columns, TVector<TString>(columns.size(), "String"), callback);
     }
 
     TActorSystemStub actorSystemStub;
@@ -46,11 +58,11 @@ Y_UNIT_TEST_SUITE(TJsonParserTests) {
     Y_UNIT_TEST_F(Simple1, TFixture) { 
         TList<TString> result;
         ui64 resultOffset;
-        MakeParser({"a1", "a2"}, [&](ui64 offset, TList<TString>&& value){
+        MakeParser({"a1", "a2"}, {"String", "Optional<Uint64>"}, [&](ui64 offset, TList<TString>&& value){
                 resultOffset = offset;
                 result = std::move(value);
             });
-        Parser->Push(5, R"({"a1": "hello1", "a2": "101",  "event": "event1"})");
+        Parser->Push(5, R"({"a1": "hello1", "a2": 101,  "event": "event1"})");
         UNIT_ASSERT_VALUES_EQUAL(5, resultOffset);
         UNIT_ASSERT_VALUES_EQUAL(2, result.size());
         UNIT_ASSERT_VALUES_EQUAL("hello1", result.front());
@@ -102,7 +114,7 @@ Y_UNIT_TEST_SUITE(TJsonParserTests) {
     Y_UNIT_TEST_F(ThrowExceptionByError, TFixture) { 
 
         MakeParser({"a2", "a1"}, [&](ui64, TList<TString>&&){ });
-        UNIT_ASSERT_EXCEPTION_CONTAINS(Parser->Push(5, R"(ydb)"), yexception, " Failed to unwrap empty optional");
+        UNIT_ASSERT_EXCEPTION_CONTAINS(Parser->Push(5, R"(ydb)"), yexception, "DB::ParsingException: Cannot parse input: expected '{' before: 'ydb': (at row 1)");
     }
 }
 
diff --git a/ydb/core/fq/libs/row_dispatcher/ut/topic_session_ut.cpp b/ydb/core/fq/libs/row_dispatcher/ut/topic_session_ut.cpp
index 8e7036f057b5..ba24378e0a35 100644
--- a/ydb/core/fq/libs/row_dispatcher/ut/topic_session_ut.cpp
+++ b/ydb/core/fq/libs/row_dispatcher/ut/topic_session_ut.cpp
@@ -81,7 +81,7 @@ class TFixture : public NUnitTest::TBaseFixture {
         settings.SetDatabase(GetDefaultPqDatabase());
         settings.AddColumns("dt");
         settings.AddColumns("value");
-        settings.AddColumnTypes("UInt64");
+        settings.AddColumnTypes("Uint64");
         settings.AddColumnTypes("String");
         if (!emptyPredicate) {
             settings.SetPredicate("WHERE true");
@@ -263,7 +263,7 @@ Y_UNIT_TEST_SUITE(TopicSessionTests) {
         const std::vector<TString> data = { "not json", "noch einmal / nicht json" };
         PQWrite(data, topicName);
 
-        ExpectSessionError(ReadActorId1, "Failed to unwrap empty optional");
+        ExpectSessionError(ReadActorId1, "DB::ParsingException: Cannot parse input: expected '{' before: 'not json': (at row 1)");
         StopSession(ReadActorId1, source);
     }
 
diff --git a/ydb/core/fq/libs/row_dispatcher/ut/ya.make b/ydb/core/fq/libs/row_dispatcher/ut/ya.make
index bb66ec57798f..25242d092f28 100644
--- a/ydb/core/fq/libs/row_dispatcher/ut/ya.make
+++ b/ydb/core/fq/libs/row_dispatcher/ut/ya.make
@@ -20,6 +20,7 @@ PEERDIR(
     ydb/library/yql/udfs/common/yson2
     ydb/tests/fq/pq_async_io
     ydb/library/yql/sql/pg_dummy
+    ydb/library/yql/udfs/common/clickhouse/client
 )
 
 SIZE(MEDIUM)