diff --git a/README.md b/README.md
index 5a5b5d6..258e7d0 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,9 @@ export default {
           b: 'a',
           a: 'hello word',
           asd2: 1,
-          asd: false
+          asd: false,
+          foo: null,
+          bar: undefined
         }
       }
     }
diff --git a/examples/app.js b/examples/app.js
index bcc4c51..36eb795 100644
--- a/examples/app.js
+++ b/examples/app.js
@@ -17,7 +17,8 @@ new Vue({
                   a: 'hello word',
                   asd2: 1,
                   asd: false,
-                  foo: null
+                  foo: null,
+                  bar: undefined
                 }
               }
         }
diff --git a/json-box.vue b/json-box.vue
index f3524a1..03de860 100644
--- a/json-box.vue
+++ b/json-box.vue
@@ -63,6 +63,7 @@ export default {
         JsonObject,
         JsonArray,
         JsonFunction,
+        JsonNull,
         JIcon
     }
 };