--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/core/json.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,5 @@
+d3.json = function(url, callback) {
+  d3.text(url, "application/json", function(text) {
+    callback(text ? JSON.parse(text) : null);
+  });
+};