diff --git a/src/common/config.cc b/src/common/config.cc
index f54c705a3..45eaea9b5 100644
--- a/src/common/config.cc
+++ b/src/common/config.cc
@@ -53,21 +53,22 @@ static const std::unordered_set<std::string> ext_legal_json_keys = {"metric_type
 
 Status
 Config::FormatAndCheck(const Config& cfg, Json& json, std::string* const err_msg) {
-    try {
-        for (auto& it : json.items()) {
-            // valid only if it.key() exists in one of cfg.__DICT__ and ext_legal_json_keys
-            if (cfg.__DICT__.find(it.key()) == cfg.__DICT__.end() &&
-                ext_legal_json_keys.find(it.key()) == ext_legal_json_keys.end()) {
-                throw KnowhereException(std::string("invalid json key ") + it.key());
-            }
-        }
-    } catch (std::exception& e) {
-        LOG_KNOWHERE_ERROR_ << e.what();
-        if (err_msg) {
-            *err_msg = e.what();
-        }
-        return Status::invalid_param_in_json;
-    }
+    // Deprecated invalid json key check for now
+    // try {
+    //     for (auto& it : json.items()) {
+    //         // valid only if it.key() exists in one of cfg.__DICT__ and ext_legal_json_keys
+    //         if (cfg.__DICT__.find(it.key()) == cfg.__DICT__.end() &&
+    //             ext_legal_json_keys.find(it.key()) == ext_legal_json_keys.end()) {
+    //             throw KnowhereException(std::string("invalid json key ") + it.key());
+    //         }
+    //     }
+    // } catch (std::exception& e) {
+    //     LOG_KNOWHERE_ERROR_ << e.what();
+    //     if (err_msg) {
+    //         *err_msg = e.what();
+    //     }
+    //     return Status::invalid_param_in_json;
+    // }
 
     try {
         for (const auto& it : cfg.__DICT__) {
diff --git a/tests/ut/test_config.cc b/tests/ut/test_config.cc
index c6b9181d3..73e688ab5 100644
--- a/tests/ut/test_config.cc
+++ b/tests/ut/test_config.cc
@@ -44,14 +44,22 @@ TEST_CASE("Test config json parse", "[config]") {
             })",
                                          R"({
                 "12-s": 19878
-            })",
+            })");
+        knowhere::BaseConfig test_config;
+        knowhere::Json test_json = knowhere::Json::parse(invalid_json_str);
+        s = knowhere::Config::FormatAndCheck(test_config, test_json);
+        CHECK(s == knowhere::Status::success);
+    }
+
+    SECTION("check invalid json values") {
+        auto invalid_json_str = GENERATE(as<std::string>{},
                                          R"({
                 "k": "100.12"
             })");
         knowhere::BaseConfig test_config;
         knowhere::Json test_json = knowhere::Json::parse(invalid_json_str);
         s = knowhere::Config::FormatAndCheck(test_config, test_json);
-        CHECK(s != knowhere::Status::success);
+        CHECK(s == knowhere::Status::invalid_value_in_json);
     }
 
     SECTION("Check the json for the specific index") {
@@ -83,7 +91,7 @@ TEST_CASE("Test config json parse", "[config]") {
         })");
         knowhere::HnswConfig hnsw_config;
         s = knowhere::Config::FormatAndCheck(hnsw_config, large_build_json);
-        CHECK(s == knowhere::Status::invalid_param_in_json);
+        CHECK(s == knowhere::Status::success);
         knowhere::DiskANNConfig diskann_config;
         s = knowhere::Config::FormatAndCheck(diskann_config, large_build_json);
         CHECK(s == knowhere::Status::success);