diff --git a/shared/parser.go b/shared/parser.go
new file mode 100644
index 0000000..7b4310b
--- /dev/null
+++ b/shared/parser.go
@@ -0,0 +1,53 @@
+package shared
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/sagernet/sing-box/experimental/libbox"
+	"github.com/xmdhs/clash2singbox/convert"
+	"github.com/xmdhs/clash2singbox/model/clash"
+	"gopkg.in/yaml.v3"
+)
+
+func ParseConfig(path string) error {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return err
+	}
+	config, err := parseClash(content)
+	if err != nil {
+		config = content
+	}
+	err = libbox.CheckConfig(string(config))
+	if err != nil {
+		return err
+	}
+	err = os.WriteFile(path, config, 0777)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func parseClash(content []byte) ([]byte, error) {
+	clashConfig := clash.Clash{}
+	err := yaml.Unmarshal(content, &clashConfig)
+	if err != nil {
+		fmt.Printf("unmarshal error %s", err)
+		return nil, err
+	}
+	sbConfig, err := convert.Clash2sing(clashConfig)
+	if err != nil {
+		fmt.Printf("convert error %s", err)
+		return nil, err
+	}
+
+	output := defaultTemplate(ConfigTemplateOptions{})
+	output, err = convert.Patch(output, sbConfig, "", "", nil)
+	if err != nil {
+		fmt.Printf("patch error %s", err)
+		return nil, err
+	}
+	return output, nil
+}