diff --git a/internal/json/json.go b/internal/json/json.go
index 69ae573c09..2cb1caf187 100644
--- a/internal/json/json.go
+++ b/internal/json/json.go
@@ -12,14 +12,18 @@ import (
 )
 
 var (
+	config = sonicjson.Config{
+		CaseSensitive: true,
+	}.Froze()
+
 	// Unmarshal is equivalent to encoding/json.Unmarshal.
-	Unmarshal = sonicjson.ConfigDefault.Unmarshal
+	Unmarshal = config.Unmarshal
 	// Marshal is equivalent to encoding/json.Marshal.
-	Marshal = sonicjson.ConfigDefault.Marshal
+	Marshal = config.Marshal
 	// NewEncoder is equivalent to encoding/json.NewEncoder.
-	NewEncoder = sonicjson.ConfigDefault.NewEncoder
+	NewEncoder = config.NewEncoder
 	// NewDecoder is equivalent to encoding/json.NewDecoder.
-	NewDecoder = sonicjson.ConfigDefault.NewDecoder
+	NewDecoder = config.NewDecoder
 	// MarshalForDeterministicTesting marshals a value to JSON in a deterministic way for testing.
 	// The normal sonic configuration does not guarantee deterministic output in terms of field order.
 	// It panics if called outside of tests.
diff --git a/tests/e2e/token_ratelimit_test.go b/tests/e2e/token_ratelimit_test.go
index 56a8c8b64a..8ef5032f78 100644
--- a/tests/e2e/token_ratelimit_test.go
+++ b/tests/e2e/token_ratelimit_test.go
@@ -179,8 +179,8 @@ func Test_Examples_TokenRateLimit(t *testing.T) {
 				Result     []struct {
 					Metric map[string]string `json:"metric"`
 					Value  []any             `json:"value"`
-				}
-			}
+				} `json:"result"`
+			} `json:"data"`
 		}
 		var pr prometheusResponse
 		require.NoError(t, json.Unmarshal(body, &pr))