diff --git a/src/json.js b/src/json.js
index 758141d..4b64afd 100644
--- a/src/json.js
+++ b/src/json.js
@@ -1,5 +1,8 @@
 function responseJson(response) {
   if (!response.ok) throw new Error(response.status + " " + response.statusText);
+  if (response.status === 204 || response.status === 205) {
+    return null;
+  }
   return response.json();
 }