diff --git a/main.py b/main.py
index 9e6466d..d2f6b4c 100644
--- a/main.py
+++ b/main.py
@@ -119,7 +119,7 @@ class WaldorfMicroWave2V00(AImage):
 			fp.write(data)
 
 	def _json_save(self, filename: str, data):
-		with open(os.path.join(self.out_dir, filename), 'wb') as fp:
+		with open(os.path.join(self.out_dir, filename), 'w') as fp:
 			json.dump(data, fp, indent=4)
 
 	@staticmethod
@@ -189,7 +189,7 @@ class PpgEvu2v00(AImage):
 
 
 def detect(args):
-	os.makedirs(args.output_dir)
+	os.makedirs(args.output_dir, exist_ok=True)
 	image = WaldorfMicroWave2V00(args.filepath, args.extra, args.output_dir)
 	pass