diff --git a/protoc-go-inject-tags/main.go b/protoc-go-inject-tags/main.go
index 39d32aa..f9a6dac 100644
--- a/protoc-go-inject-tags/main.go
+++ b/protoc-go-inject-tags/main.go
@@ -34,6 +34,7 @@ func init() {
 	flag.StringVar(&ignore, "ignore", "", "ignore fields for struct eg: form:file,json:file")
 	fset = token.NewFileSet()
 }
+
 func main() {
 	flag.Parse()
 
@@ -131,39 +132,51 @@ func handleTags(fields *ast.FieldList) {
 			continue
 		}
 
-		var newName string
+		var jsonName string
 		for _, name := range field.Names {
-			newName = strings.ToLower(strings.Join(camelcase.Split(name.Name), "_"))
+			jsonName = strings.ToLower(strings.Join(camelcase.Split(name.Name), "_"))
 		}
-
 		tv := strings.ReplaceAll(field.Tag.Value, "`", "")
 		tagList := strings.Split(tv, " ")
-		fieldTags := make(map[string]*fieldTag, 0)
+		fieldTags := make(map[string]*fieldTag)
 		var sortTags []string
+
 		for _, t := range tagList {
 			tf := strings.Split(t, ":")
 			if len(tf) != 2 {
 				continue
 			}
-			fieldTags[tf[0]] = &fieldTag{
-				tagName:  strings.TrimSpace(tf[0]),
-				tagValue: strings.Replace(tf[1], "\"", "", -1),
+			tagName := strings.TrimSpace(tf[0])
+			tagValue := strings.Replace(tf[1], "\"", "", -1)
+			fieldTags[tagName] = &fieldTag{
+				tagName:  tagName,
+				tagValue: tagValue,
+			}
+			sortTags = append(sortTags, tagName)
+
+			if tagName == "protobuf" {
+				if jsonIndex := strings.Index(tagValue, "json="); jsonIndex != -1 {
+					jsonValue := tagValue[jsonIndex+5:]
+					jsonValue = strings.Split(jsonValue, ",")[0]
+					jsonName = jsonValue
+				}
 			}
-			sortTags = append(sortTags, tf[0])
 		}
 
 		for _, tag := range tagsValue {
-			if _, ok := fieldTags[tag]; ok {
-				continue
-			}
-
-			fieldTags[tag] = &fieldTag{tagName: tag, tagValue: fmt.Sprintf("%s,omitempty", newName)}
+			fieldTags[tag] = &fieldTag{tagName: tag, tagValue: fmt.Sprintf("%s,omitempty", jsonName)}
 			sortTags = append(sortTags, tag)
 		}
 
+		fieldTags["json"] = &fieldTag{tagName: "json", tagValue: fmt.Sprintf("%s,omitempty", jsonName)}
+
 		var newTags string
+		seenTags := make(map[string]bool)
 		for _, tag := range sortTags {
-			newTags += fmt.Sprintf("%s:\"%s\" ", fieldTags[tag].tagName, fieldTags[tag].tagValue)
+			if !seenTags[tag] {
+				newTags += fmt.Sprintf("%s:\"%s\" ", fieldTags[tag].tagName, fieldTags[tag].tagValue)
+				seenTags[tag] = true
+			}
 		}
 
 		for _, v := range ignoreFields {
@@ -172,6 +185,6 @@ func handleTags(fields *ast.FieldList) {
 			}
 		}
 
-		field.Tag.Value = fmt.Sprintf("`%s`", newTags)
+		field.Tag.Value = fmt.Sprintf("`%s`", strings.TrimSpace(newTags))
 	}
 }