diff --git a/cmd/config/default.go b/cmd/config/default.go
index 6a6cb97..c976548 100644
--- a/cmd/config/default.go
+++ b/cmd/config/default.go
@@ -10,41 +10,45 @@ import (
     "path"
 )
 
-var defaultConfig = `# default configure file for xproxy
-proxy:
-  core: xray
-  log: warning
-
-network:
-  bypass:
-    - 169.254.0.0/16
-    - 224.0.0.0/3
-    - fc00::/7
-    - fe80::/10
-    - ff00::/8
-
-asset:
-  update:
-    cron: "0 5 6 * * *"
-    url:
-      geoip.dat: https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/geoip.dat
-      geosite.dat: https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/geosite.dat
-`
+var defaultConfig = map[string]interface{}{
+    "proxy": map[string]string{
+        "core": "xray",
+        "log":  "warning",
+    },
+    "network": map[string]interface{}{
+        "bypass": []string{
+            "169.254.0.0/16",
+            "224.0.0.0/3",
+            "fc00::/7",
+            "fe80::/10",
+            "ff00::/8",
+        },
+    },
+    "asset": map[string]interface{}{
+        "update": map[string]interface{}{
+            "cron": "0 5 6 * * *",
+            "url": map[string]string{
+                "geoip.dat":   "https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/geoip.dat",
+                "geosite.dat": "https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/geosite.dat",
+            },
+        },
+    },
+}
 
-func toJSON(yamlConfig string) string { // YAML -> JSON
-    var config interface{}
-    if err := yaml.Unmarshal([]byte(yamlConfig), &config); err != nil {
-        log.Panicf("Default config error -> %v", err)
-    }
-    jsonRaw, _ := json.Marshal(config)
+func toJSON(config interface{}) string { // convert to JSON string
+    jsonRaw, _ := json.MarshalIndent(config, "", "  ")
     return string(jsonRaw)
 }
 
-func toTOML(yamlConfig string) string { // YAML -> TOML
-    var config interface{}
-    if err := yaml.Unmarshal([]byte(yamlConfig), &config); err != nil {
-        log.Panicf("Default config error -> %v", err)
-    }
+func toYAML(config interface{}) string { // convert to YAML string
+    buf := new(bytes.Buffer)
+    encoder := yaml.NewEncoder(buf)
+    encoder.SetIndent(2) // with 2 space indent
+    _ = encoder.Encode(config)
+    return buf.String()
+}
+
+func toTOML(config interface{}) string { // convert to TOML string
     buf := new(bytes.Buffer)
     _ = toml.NewEncoder(buf).Encode(config)
     return buf.String()
@@ -54,9 +58,10 @@ func loadDefaultConfig(configFile string) {
     log.Infof("Load default configure -> %s", configFile)
     suffix := path.Ext(configFile)
     if suffix == ".json" {
-        defaultConfig = toJSON(defaultConfig)
+        common.WriteFile(configFile, toJSON(defaultConfig), false) // JSON format
     } else if suffix == ".toml" {
-        defaultConfig = toTOML(defaultConfig)
+        common.WriteFile(configFile, toTOML(defaultConfig), false) // TOML format
+    } else {
+        common.WriteFile(configFile, toYAML(defaultConfig), false) // YAML format
     }
-    common.WriteFile(configFile, defaultConfig, false)
 }