diff --git a/src/Command/Service/MongoDB/MongoExportCommand.php b/src/Command/Service/MongoDB/MongoExportCommand.php
index cfbf7ea49..d298f85f9 100644
--- a/src/Command/Service/MongoDB/MongoExportCommand.php
+++ b/src/Command/Service/MongoDB/MongoExportCommand.php
@@ -108,13 +108,21 @@ private function getCollections(array $service, HostInterface $host)
 
         $command = 'mongo '
             . $relationshipsService->getDbCommandArgs('mongo', $service)
-            . ' --quiet --eval ' . OsUtil::escapePosixShellArg($js);
+            . ' --quiet --eval ' . OsUtil::escapePosixShellArg($js)
+            . ' 2>/dev/null';
 
         $result = $host->runCommand($command);
         if (!is_string($result)) {
             return [];
         }
 
+        // Handle log messages that mongo prints to stdout.
+        // https://jira.mongodb.org/browse/SERVER-23810
+        // Hopefully the end of the output is a JavaScript array.
+        if (substr($result, -1) === ']' && substr(trim($result), 0, 1) !== '[' && ($openPos = strrpos($result, "\n[")) !== false) {
+            $result = substr($result, $openPos);
+        }
+
         $collections = json_decode($result, true) ?: [];
 
         return array_filter($collections, function ($collection) {
diff --git a/src/Service/Relationships.php b/src/Service/Relationships.php
index d761401dc..179ad58a8 100644
--- a/src/Service/Relationships.php
+++ b/src/Service/Relationships.php
@@ -274,6 +274,12 @@ public function getDbCommandArgs($command, array $database, $schema = null)
             case 'mongodump':
             case 'mongoexport':
             case 'mongorestore':
+                if (isset($database['url'])) {
+                    if ($command === 'mongo') {
+                        return $database['url'];
+                    }
+                    return sprintf('--uri %s', OsUtil::escapePosixShellArg($database['url']));
+                }
                 $args = sprintf(
                     '--username %s --password %s --host %s --port %d',
                     OsUtil::escapePosixShellArg($database['username']),