return 400 on invalid json post data

sanic/request.py

@@ -4,6 +4,7 @@ from http.cookies import SimpleCookie
 from httptools import parse_url
 from urllib.parse import parse_qs
 from ujson import loads as json_loads
+from sanic.exceptions import InvalidUsage
 
 from .log import log
 
@@ -67,7 +68,7 @@ class Request(dict):
             try:
                 self.parsed_json = json_loads(self.body)
             except Exception:
-                log.exception("Failed when parsing body as json")
+                raise InvalidUsage("Failed when parsing body as json")
 
         return self.parsed_json
 

tests/test_requests.py

@@ -49,6 +49,19 @@ def test_json():
     assert results.get('test') == True
 
 
+def test_invalid_json():
+    app = Sanic('test_json')
+
+    @app.route('/')
+    async def handler(request):
+        return json(request.json())
+
+    data = "I am not json"
+    request, response = sanic_endpoint_test(app, data=data)
+
+    assert response.status == 400
+
+
 def test_query_string():
     app = Sanic('test_query_string')