diff --git a/datasette/app.py b/datasette/app.py
index 8fb772f3..84285752 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -3,7 +3,6 @@ import click
 import collections
 import hashlib
 import itertools
-import json
 import os
 import sqlite3
 import sys
@@ -21,7 +20,6 @@ from sanic.exceptions import InvalidUsage, NotFound
 
 from .views.base import (
     DatasetteError,
-    RenderMixin,
     ureg
 )
 from .views.database import DatabaseDownload, DatabaseView