Changed error message to include actual exception contents

flask/wrappers.py

@@ -177,7 +177,7 @@ class Request(RequestBase):
         ctx = _request_ctx_stack.top
         if ctx is not None:
             if ctx.app.config.get('DEBUG', False):
-                raise BadRequest('No JSON object could be decoded')
+                raise BadRequest('Failed to decode JSON object: {}'.format(e))
         raise BadRequest()
 
     def _load_form_data(self):

tests/test_helpers.py

@@ -59,7 +59,7 @@ class TestJSON(object):
         c = app.test_client()
         rv = c.post('/json', data=None, content_type='application/json')
         assert rv.status_code == 400
-        assert b'No JSON object could be decoded' in rv.data
+        assert b'Failed to decode JSON object' in rv.data
 
     def test_post_empty_json_wont_add_exception_to_response_if_no_debug(self):
         app = flask.Flask(__name__)
@@ -71,7 +71,7 @@ class TestJSON(object):
         c = app.test_client()
         rv = c.post('/json', data=None, content_type='application/json')
         assert rv.status_code == 400
-        assert b'No JSON object could be decoded' not in rv.data
+        assert b'Failed to decode JSON object' not in rv.data
 
     def test_json_bad_requests(self):
         app = flask.Flask(__name__)