Issue #3239006 by vierlex: Skip logging when using drush & JSON formatting

updated batch detection

src/Logger/Stdout.php

@@ -70,6 +70,18 @@ class Stdout implements LoggerInterface {
     if (empty($fmt)) {
       $fmt = '[@severity] [@type] [@date] @message | uid: @uid | request-uri: @request_uri | refer: @referer | ip:  @ip | link: @link';
     }
+    elseif (json_validate($fmt)) {
+      if (PHP_SAPI === 'cli') {
+        $arg = \Drush\Drush::input()->getFirstArgument();
+        if( mb_strpos($arg, 'batch-process') !== FALSE){
+          # https://www.drupal.org/project/log_stdout/issues/3239006
+          # Switch back to default formattting
+          # to avoid error when using JSON Output
+          # while drush is running a Batch API process
+          $fmt = '@date|@timestamp|@severity|@type|@message|@uid|@request_uri|@referer|@ip|@link';
+        }
+      }
+    }
 
     $entry = strtr($fmt, [
       '@base_url'    => $base_url,