diff --git a/island/config.py b/island/config.py
index 1718d59..2c64539 100644
--- a/island/config.py
+++ b/island/config.py
@@ -30,8 +30,9 @@ class Config():
 		self.load()
 		
 	
-	def load(self):
-		config_property = tools.file_read_data(env.get_island_path_config())
+	# set it deprecated at 2020/07
+	def load_old(self):
+		config_property = tools.file_read_data(env.get_island_path_config_old())
 		element_config = config_property.split("\n")
 		for line in element_config:
 			if    len(line) == 0 \
@@ -48,9 +49,39 @@ class Config():
 				debug.warning("island config error: can not parse: '" + str(line) + "'")
 		return True
 	
+	def convert_config_file(self):
+		debug.warning("INTERNAL: Convert your configuration file: " + str(env.get_island_path_config_old()) + " -> " + str(env.get_island_path_config()))
+		self.load_old()
+		self.store()
+		tools.remove_file(env.get_island_path_config_old())
+	
+	def load(self):
+		# transform the old format of configuration (use json now ==> simple
+		if os.path.exists(env.get_island_path_config_old()) == True:
+			self.convert_config_file()
+		if os.path.exists(env.get_island_path_config()) == False:
+			return True
+		self._volatiles = []
+		with open(env.get_island_path_config()) as json_file:
+			data = json.load(json_file)
+			if "repo" in data.keys():
+				self._repo = data["repo"]
+			if "branch" in data.keys():
+				self._branch = data["branch"]
+			if "manifest_name" in data.keys():
+				self._manifest_name = data["manifest_name"]
+			return True
+		return False
+	
 	def store(self):
-		data = "repo=" + self._repo + "\nbranch=" + self._branch + "\nfile=" + self._manifest_name
-		tools.file_write_data(env.get_island_path_config(), data)
+		data = {}
+		data["repo"] = self._repo
+		data["branch"] = self._branch
+		data["manifest_name"] = self._manifest_name
+		with open(env.get_island_path_config(), 'w') as outfile:
+			json.dump(data, outfile, indent=4)
+			return True
+		return False
 	
 	def set_manifest(self, value):
 		self._repo = value
diff --git a/island/env.py b/island/env.py
index c32f1f5..a4b9732 100644
--- a/island/env.py
+++ b/island/env.py
@@ -102,7 +102,8 @@ else:
 	pass
 island_path_user_config = os.path.join(island_root_path, get_system_config_name())
 island_path = os.path.join(island_root_path, "." + get_system_base_name())
-island_path_config = os.path.join(island_path, "config.txt")
+island_path_config_old = os.path.join(island_path, "config.txt")
+island_path_config = os.path.join(island_path, "config.json")
 island_path_manifest = os.path.join(island_path, "manifest")
 
 ##
@@ -121,6 +122,10 @@ def get_island_path_config():
 	global island_path_config
 	return island_path_config
 
+def get_island_path_config_old():
+	global island_path_config_old
+	return island_path_config_old
+
 def get_island_path_manifest():
 	global island_path_manifest
 	return island_path_manifest