diff --git a/core/conf/config.go b/core/conf/config.go
index aaa69b8d..9f1baf6c 100644
--- a/core/conf/config.go
+++ b/core/conf/config.go
@@ -13,7 +13,10 @@ import (
 	"github.com/zeromicro/go-zero/internal/encoding"
 )
 
-const jsonTagKey = "json"
+const (
+	jsonTagKey = "json"
+	jsonTagSep = ','
+)
 
 var (
 	fillDefaultUnmarshaler = mapping.NewUnmarshaler(jsonTagKey, mapping.WithDefault())
@@ -257,7 +260,14 @@ func buildStructFieldsInfo(tp reflect.Type) (*fieldInfo, error) {
 
 func getTagName(field reflect.StructField) string {
 	if tag, ok := field.Tag.Lookup(jsonTagKey); ok {
-		return tag
+		if pos := strings.IndexByte(tag, jsonTagSep); pos >= 0 {
+			tag = tag[:pos]
+		}
+		tag = strings.TrimSpace(tag)
+
+		if len(tag) > 0 {
+			return tag
+		}
 	}
 
 	return field.Name
diff --git a/core/conf/config_test.go b/core/conf/config_test.go
index 5ce32051..72392511 100644
--- a/core/conf/config_test.go
+++ b/core/conf/config_test.go
@@ -1076,44 +1076,86 @@ func TestFillDefaultUnmarshal(t *testing.T) {
 
 func TestConfigWithJsonTag(t *testing.T) {
 	t.Run("map with value", func(t *testing.T) {
-		var input = []byte(`[BannedNotificationTemplates]
-[BannedNotificationTemplates.pt-BR]
-EmailTemplate = "910707,2,3,4"
-[BannedNotificationTemplates.ch-MY]
-EmailTemplate = "910707,2,3,4"`)
+		var input = []byte(`[Value]
+[Value.first]
+Email = "foo"
+[Value.second]
+Email = "bar"`)
 
-		type BannedNotificationTemplates struct {
-			EmailTemplate string
+		type Value struct {
+			Email string
 		}
 
 		type Config struct {
-			BannedNotificationTemplatesMap map[string]BannedNotificationTemplates `json:"BannedNotificationTemplates"` // 各个语言的封禁模板设置, map.key=语言
+			ValueMap map[string]Value `json:"Value"`
 		}
 
 		var c Config
 		if assert.NoError(t, LoadFromTomlBytes(input, &c)) {
-			assert.Len(t, c.BannedNotificationTemplatesMap, 2)
+			assert.Len(t, c.ValueMap, 2)
 		}
 	})
 
 	t.Run("map with ptr value", func(t *testing.T) {
-		var input = []byte(`[BannedNotificationTemplates]
-[BannedNotificationTemplates.pt-BR]
-EmailTemplate = "910707,2,3,4"
-[BannedNotificationTemplates.ch-MY]
-EmailTemplate = "910707,2,3,4"`)
+		var input = []byte(`[Value]
+[Value.first]
+Email = "foo"
+[Value.second]
+Email = "bar"`)
 
-		type BannedNotificationTemplates struct {
-			EmailTemplate string
+		type Value struct {
+			Email string
 		}
 
 		type Config struct {
-			BannedNotificationTemplatesMap map[string]*BannedNotificationTemplates `json:"BannedNotificationTemplates"` // 各个语言的封禁模板设置, map.key=语言
+			ValueMap map[string]*Value `json:"Value"`
 		}
 
 		var c Config
 		if assert.NoError(t, LoadFromTomlBytes(input, &c)) {
-			assert.Len(t, c.BannedNotificationTemplatesMap, 2)
+			assert.Len(t, c.ValueMap, 2)
+		}
+	})
+
+	t.Run("map with optional", func(t *testing.T) {
+		var input = []byte(`[Value]
+[Value.first]
+Email = "foo"
+[Value.second]
+Email = "bar"`)
+
+		type Value struct {
+			Email string
+		}
+
+		type Config struct {
+			Value map[string]Value `json:",optional"`
+		}
+
+		var c Config
+		if assert.NoError(t, LoadFromTomlBytes(input, &c)) {
+			assert.Len(t, c.Value, 2)
+		}
+	})
+
+	t.Run("map with empty tag", func(t *testing.T) {
+		var input = []byte(`[Value]
+[Value.first]
+Email = "foo"
+[Value.second]
+Email = "bar"`)
+
+		type Value struct {
+			Email string
+		}
+
+		type Config struct {
+			Value map[string]Value `json:"  "`
+		}
+
+		var c Config
+		if assert.NoError(t, LoadFromTomlBytes(input, &c)) {
+			assert.Len(t, c.Value, 2)
 		}
 	})
 }
diff --git a/core/mapping/utils.go b/core/mapping/utils.go
index 5ac706fe..88886228 100644
--- a/core/mapping/utils.go
+++ b/core/mapping/utils.go
@@ -255,7 +255,7 @@ func parseGroupedSegments(val string) []string {
 
 // don't modify returned fieldOptions, it's cached and shared among different calls.
 func parseKeyAndOptions(tagName string, field reflect.StructField) (string, *fieldOptions, error) {
-	value := field.Tag.Get(tagName)
+	value := strings.TrimSpace(field.Tag.Get(tagName))
 	if len(value) == 0 {
 		return field.Name, nil, nil
 	}
diff --git a/core/mapping/utils_test.go b/core/mapping/utils_test.go
index 854ffa46..84e0acf2 100644
--- a/core/mapping/utils_test.go
+++ b/core/mapping/utils_test.go
@@ -144,6 +144,10 @@ func TestParseSegments(t *testing.T) {
 			input:  "",
 			expect: []string{},
 		},
+		{
+			input:  "   ",
+			expect: []string{},
+		},
 		{
 			input:  ",",
 			expect: []string{""},