diff --git a/AK/JsonObjectSerializer.h b/AK/JsonObjectSerializer.h
index 0c6b1eda97..8de17cead6 100644
--- a/AK/JsonObjectSerializer.h
+++ b/AK/JsonObjectSerializer.h
@@ -109,6 +109,12 @@ public:
         m_builder.appendf("%llu", value);
     }
 
+    void add(const StringView& key, double value)
+    {
+        begin_item(key);
+        m_builder.appendf("%f", value);
+    }
+
     JsonArraySerializer<Builder> add_array(const StringView& key)
     {
         begin_item(key);
diff --git a/AK/JsonParser.cpp b/AK/JsonParser.cpp
index 0f2fccfa64..1007c46779 100644
--- a/AK/JsonParser.cpp
+++ b/AK/JsonParser.cpp
@@ -100,9 +100,11 @@ String JsonParser::consume_quoted_string()
         char escaped_ch = consume();
         switch (escaped_ch) {
         case 'n':
-        case 'r':
             buffer.append('\n');
             break;
+        case 'r':
+            buffer.append('\r');
+            break;
         case 't':
             buffer.append('\t');
             break;
@@ -225,6 +227,7 @@ JsonValue JsonParser::parse_number()
         ASSERT(ok);
 
         int fraction = fraction_string.to_uint(ok);
+        fraction *= (whole < 0) ? -1 : 1;
         ASSERT(ok);
 
         auto divider = 1;