Created json formatter and validator. (#82)

Co-authored-by: mikolaj widla <mikolaj.widla@gmail.com>
Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Co-authored-by: Adam Bem <bema@noreply.example.com>
Co-authored-by: Artur Kołecki <koleckiartur@icloud.com>
Reviewed-on: R11/release11-tools-web#82

Frontend/assets/scripts/tools/scripts.js

@@ -43,6 +43,10 @@ function setDefaultContent(element, text) {
             element.style.color = color_grey;
             element.value = text;
         }
+        if (id == "jsonArea") {
+            element.style.color = color_grey;
+            element.value = text;
+        }
     }
 }