diff --git a/src/Illuminate/Support/Str.php b/src/Illuminate/Support/Str.php
index da9540e29ede..ae0849434b14 100644
--- a/src/Illuminate/Support/Str.php
+++ b/src/Illuminate/Support/Str.php
@@ -452,6 +452,10 @@ public static function isJson($value)
             return false;
         }
 
+        if (function_exists('json_validate')) {
+            return json_validate($value, 512);
+        }
+
         try {
             json_decode($value, true, 512, JSON_THROW_ON_ERROR);
         } catch (JsonException) {