diff --git a/internal/twirptest/json_serialization/json_serialization_test.go b/internal/twirptest/json_serialization/json_serialization_test.go
index 7d507102..53d51033 100644
--- a/internal/twirptest/json_serialization/json_serialization_test.go
+++ b/internal/twirptest/json_serialization/json_serialization_test.go
@@ -218,7 +218,7 @@ func TestJSONSerializationCamelCase(t *testing.T) {
 	s := httptest.NewServer(
 		NewJSONSerializationServer(
 			&JSONSerializationService{},
-			twirp.WithServerJSONCamelCaseNames(),
+			twirp.WithServerJSONCamelCaseNames(true),
 		),
 	)
 	defer s.Close()
diff --git a/server_options.go b/server_options.go
index 215b726b..8bb7da1b 100644
--- a/server_options.go
+++ b/server_options.go
@@ -179,9 +179,13 @@ func WithServerJSONSkipDefaults(skipDefaults bool) ServerOption {
 }
 
 // WithServerJSONCamelCaseNames configures JSON serialization to use
-// lowerCamelCase field names rather than proto snake_case names.
-func WithServerJSONCamelCaseNames() ServerOption {
+// lowerCameCase field names rather than the original proto field names.
+// It is disabled by default, because JSON is commonly used for manual
+// debugging. But sometimes converting to lowerCamelCase is needed
+// to match the default canonical encoding on other proto-json parsers.
+// See: https://developers.google.com/protocol-buffers/docs/proto3#json
+func WithServerJSONCamelCaseNames(val bool) ServerOption {
 	return func(o *ServerOptions) {
-		o.JSONCamelCaseNames = true
+		o.JSONCamelCaseNames = val
 	}
 }
diff --git a/server_options_test.go b/server_options_test.go
index 0dd5234f..6c9afa94 100644
--- a/server_options_test.go
+++ b/server_options_test.go
@@ -125,7 +125,7 @@ func TestWithJSONSkipDefaults(t *testing.T) {
 func TestWithServerJSONCamelCaseNames(t *testing.T) {
 	opts := &ServerOptions{}
 
-	WithServerJSONCamelCaseNames()(opts)
+	WithServerJSONCamelCaseNames(true)(opts)
 	if !opts.JSONCamelCaseNames {
 		t.Errorf("opts.JSONCamelCaseNames expected to be true, but it is false")
 	}