diff --git a/src/customSanitizers.js b/src/customSanitizers.js
index 42ccd803e04d167419f825048a74d63e862364cb..39a8b369d6ec1855d33422c531f1bddd9c788d89 100644
--- a/src/customSanitizers.js
+++ b/src/customSanitizers.js
@@ -1,6 +1,21 @@
 const toLower = (value) => {
-  if(!value) return;
+  if (!value) return;
   return value.toLowerCase();
 }
 
-module.exports = { toLower };
\ No newline at end of file
+const toUpper = (value) => {
+  if (!value) return;
+  return value.toUpperCase();
+}
+
+const boundingboxIsValid = (value) => {
+  let tokens = value.split(",");
+  tokens = tokens.map(token => parseFloat(token));
+  if (tokens[0] < tokens[2] && tokens[1] < tokens[3]) {
+    return true;
+  }
+  return false;
+
+}
+
+module.exports = { toLower, toUpper, boundingboxIsValid };
\ No newline at end of file