diff --git a/config.go b/config.go
index 981c4e9..70dedc1 100644
--- a/config.go
+++ b/config.go
@@ -48,6 +48,7 @@ func (c *config) dump() ([]byte, error) {
 	if err = json.Indent(&out, b, "", "    "); err != nil {
 		return nil, err
 	}
+	out.WriteByte('\n')
 
 	return out.Bytes(), nil
 }
diff --git a/demo/config.json b/demo/config.json
new file mode 100644
index 0000000..1bc4ab9
--- /dev/null
+++ b/demo/config.json
@@ -0,0 +1,14 @@
+{
+    "app_name": "",
+    "build_number": 0,
+    "enable_sign_in": false,
+    "database_driver": "",
+    "database_config": {
+        "hostname": "",
+        "port": 0,
+        "username": "",
+        "password": "",
+        "database": ""
+    },
+    "sensitive_data": ""
+}
diff --git a/manager.go b/manager.go
index ff3cf8e..afe878c 100644
--- a/manager.go
+++ b/manager.go
@@ -33,10 +33,15 @@ func New(conf interface{}) *Manager {
 			path: configPath,
 		},
 	}
+	mgr.bootstrap()
 
 	return mgr
 }
 
+func (m *Manager) Config() interface{} {
+	return m.conf.config
+}
+
 func (m *Manager) StartServer() {
 	srv := &server{
 		manager: m,
@@ -44,3 +49,27 @@ func (m *Manager) StartServer() {
 	}
 	srv.start()
 }
+
+func (m *Manager) bootstrap() {
+	if m.file.isExist() {
+		b, err := m.file.read()
+		if err != nil {
+			panic(err)
+		}
+
+		err = m.conf.load(b)
+		if err != nil {
+			panic(err)
+		}
+	} else {
+		b, err := m.conf.dump()
+		if err != nil {
+			panic(err)
+		}
+
+		err = m.file.write(b)
+		if err != nil {
+			panic(err)
+		}
+	}
+}