diff --git a/models/Checkjson.js b/models/Checkjson.js
index 544aa48..8bca908 100755
--- a/models/Checkjson.js
+++ b/models/Checkjson.js
@@ -20,9 +20,9 @@ Checkjson.schema.properties.type.integer = (n) =>
 Checkjson.schema.properties.type.float = (n) =>
   n != "" && !isNaN(n) && Math.round(n) != n; //not yet in json schema
 Checkjson.schema.properties.minLength = (str, min) =>
-  typeof str === "string" && str.length > parseInt(min);
+  typeof str === "string" && str.length >= parseInt(min);
 Checkjson.schema.properties.maxLength = (str, max) =>
-  typeof str === "string" && str.length < parseInt(max);
+  typeof str === "string" && str.length <= parseInt(max);
 Checkjson.schema.properties.multipleOf = (n, val) =>
   typeof n === "number" &&
   typeof val === "number" &&
@@ -93,6 +93,7 @@ Checkjson.schema.properties.format = {
     /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/,
   "idn-email": / /,
   uuid: /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/,
+  url:/^(?:(?:https?|ftp):\/\/)(?:\w+(?::\w+)?@)?(?:(?:[a-z0-9-\.]+\.[a-z]{2,})(?:[-a-z0-9+\._\%\!\\[\]\(\)\,\*\?\&\=\:]*){1,})|(?:(?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?)\.(?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9][0-9]?))(?:[:\/#][^#]*)?)$/,
   uri: / /,
   "uri-reference": / /,
   iri: / /,