diff --git a/api/__init__.py b/api/__init__.py
index 727919c..a16b28b 100755
--- a/api/__init__.py
+++ b/api/__init__.py
@@ -30,17 +30,14 @@ def set_formatter():
 	else:
 		request.formatter = ResponseHelper.responsize_xml
 
+	request.error_formatter = lambda code, msg: request.formatter({ 'error': { 'code': code, 'message': msg } }, error = True)
+
 @app.before_request
 def authorize():
 	if not request.path.startswith('/rest/'):
 		return
 
-	error = request.formatter({
-		'error': {
-			'code': 40,
-			'message': 'Unauthorized'
-		}
-	}, error = True), 401
+	error = request.error_formatter(40, 'Unauthorized'), 401
 
 	(username, decoded_pass) = map(request.args.get, [ 'u', 'p' ])
 	if not username or not decoded_pass:
@@ -73,12 +70,7 @@ def not_found(error):
 	if not request.path.startswith('/rest/'):
 		return error
 
-	return request.formatter({
-		'error': {
-			'code': 0,
-			'message': 'Not implemented'
-		}
-	}, error = True), 501
+	return request.error_formatter(0, 'Not implemented'), 501
 
 class ResponseHelper:
 
diff --git a/api/albums_songs.py b/api/albums_songs.py
index e07db20..e2a361c 100755
--- a/api/albums_songs.py
+++ b/api/albums_songs.py
@@ -17,12 +17,7 @@ def rand_songs():
 		toYear = int(toYear) if toYear else None
 		fid = uuid.UUID(musicFolderId) if musicFolderId else None
 	except:
-		return request.formatter({
-			'error': {
-				'code': 0,
-				'message': 'Invalid parameter format'
-			}
-		}, error = True)
+		return request.error_formatter(0, 'Invalid parameter format')
 
 	query = Track.query
 	if fromYear:
diff --git a/api/browse.py b/api/browse.py
index 276a7f4..f8ffd58 100755
--- a/api/browse.py
+++ b/api/browse.py
@@ -24,12 +24,7 @@ def list_indexes():
 		try:
 			ifModifiedSince = int(ifModifiedSince)
 		except:
-			return request.formatter({
-				'error': {
-					'code': 0,
-					'message': 'Invalid timestamp'
-				}
-			}, error = True)
+			return request.error_formatter(0, 'Invalid timestamp')
 
 	if musicFolderId is None:
 		folder = MusicFolder.query.all()
@@ -37,22 +32,12 @@ def list_indexes():
 		try:
 			mfid = uuid.UUID(musicFolderId)
 		except:
-			return request.formatter({
-				'error': {
-					'code': 0,
-					'message': 'Invalid id'
-				}
-			}, error = True)
+			return request.error_formatter(0, 'Invalid id')
 
 		folder = MusicFolder.query.get(mfid)
 
 	if not folder:
-		return request.formatter({
-			'error': {
-				'code': 70,
-				'message': 'Folder not found'
-			}
-		}, error = True)
+		return request.error_formatter(70, 'Folder not found')
 
 	last_modif = max(map(lambda f: f.last_scan, folder)) if type(folder) is list else folder.last_scan
 	last_modif_ts = int(time.mktime(last_modif.timetuple()))
diff --git a/api/media.py b/api/media.py
index 9b34bd8..1e3144a 100755
--- a/api/media.py
+++ b/api/media.py
@@ -9,42 +9,22 @@ import os.path, uuid
 def stream_media():
 	id, maxBitRate, format, timeOffset, size, estimateContentLength = map(request.args.get, [ 'id', 'maxBitRate', 'format', 'timeOffset', 'size', 'estimateContentLength' ])
 	if not id:
-		return request.formatter({
-			'error': {
-				'code': 10,
-				'message': 'Missing media id'
-			}
-		}, error = True)
+		return request.error_formatter(10, 'Missing media id')
 
 	try:
 		tid = uuid.UUID(id)
 	except:
-		return request.formatter({
-			'error': {
-				'code': 0,
-				'Message': 'Invalid media id'
-			}
-		}, error = True)
+		return request.error_formatter(0, 'Invalid media id')
 
 	track = Track.query.get(tid)
 	if not track:
-		return request.formatter({
-			'error': {
-				'code': 70,
-				'message': 'Media not found'
-			}
-		}, error = True), 404
+		return request.error_formatter(70, 'Media not found'), 404
 
 	if maxBitRate:
 		try:
 			maxBitRate = int(maxBitRate)
 		except:
-			return request.formatter({
-				'error': {
-					'code': 0,
-					'message': 'Invalid bitrate value'
-				}
-			}, error = True)
+			return request.error_formatter(0, 'Invalid bitrate value')
 
 		if track.bitrate > maxBitRate:
 			# TODO transcode
diff --git a/api/user.py b/api/user.py
index 947677e..2200d7a 100755
--- a/api/user.py
+++ b/api/user.py
@@ -8,21 +8,11 @@ from db import User
 def user_info():
 	username = request.args.get('username')
 	if username is None:
-		return request.formatter({
-			'error': {
-				'code': 10,
-				'message': 'Missing username'
-			}
-		}, error = True)
+		return request.error_formatter(10, 'Missing username')
 
 	user = User.query.filter(User.name == username).first()
 	if user is None:
-		return request.formatter({
-			'error': {
-				'code': 0,
-				'message': 'Unkwown user'
-			}
-		}, error = True)
+		return request.error_formatter(0, 'Unknown user')
 
 	return request.formatter({
 		'user': {