diff --git a/app/preinit/extends.js b/app/preinit/extends.js
new file mode 100644
index 0000000..efba6a9
--- /dev/null
+++ b/app/preinit/extends.js
@@ -0,0 +1,6 @@
+module.exports = function(app){
+	String.prototype.injectParam = function(param, value){
+		var regexp = new RegExp(":"+param, "g");
+		return this.toString().replace(regexp, value);
+	}
+}