diff --git a/script.js b/script.js
index a81a11a..4467bf4 100644
--- a/script.js
+++ b/script.js
@@ -226,4 +226,13 @@ async function fetchWithTimeout(resource, options = {}) {
     clearTimeout(id);
 
     return response;
+}
+
+function isValidJson(json) {
+    try {
+        JSON.parse(json);
+    } catch (e) {
+        return false;
+    }
+    return true;
 }
\ No newline at end of file