diff --git a/phpstan.neon b/phpstan.neon
index 1e399523bcd2..59ef8f43c635 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -259,3 +259,4 @@ parameters:
 
         # known value
         - "#^Parameter \\#1 \\$variable of class Rector\\\\Php70\\\\ValueObject\\\\VariableAssignPair constructor expects PhpParser\\\\Node\\\\Expr\\\\ArrayDimFetch\\|PhpParser\\\\Node\\\\Expr\\\\PropertyFetch\\|PhpParser\\\\Node\\\\Expr\\\\StaticPropertyFetch\\|PhpParser\\\\Node\\\\Expr\\\\Variable, PhpParser\\\\Node\\\\Expr given\\.$#"
+        - '#Cannot cast \(array<string\>\)\|string\|true to string#'
diff --git a/src/Configuration/Configuration.php b/src/Configuration/Configuration.php
index 17a47e780480..03b4119b66ae 100644
--- a/src/Configuration/Configuration.php
+++ b/src/Configuration/Configuration.php
@@ -49,6 +49,11 @@ final class Configuration
      */
     private $mustMatchGitDiff = false;
 
+    /**
+     * @var string
+     */
+    private $outputFile;
+
     /**
      * Needs to run in the start of the life cycle, since the rest of workflow uses it.
      */
@@ -59,6 +64,9 @@ public function resolveFromInput(InputInterface $input): void
         $this->mustMatchGitDiff = (bool) $input->getOption(Option::MATCH_GIT_DIFF);
         $this->showProgressBar = $this->canShowProgressBar($input);
 
+        $outputFileOption = $input->getOption(Option::OPTION_OUTPUT_FILE);
+        $this->outputFile = $outputFileOption ? (string) $outputFileOption : null;
+
         /** @var string|null $onlyRector */
         $onlyRector = $input->getOption(Option::OPTION_ONLY);
 
@@ -129,6 +137,11 @@ public function getOnlyRector(): ?string
         return $this->onlyRector;
     }
 
+    public function getOutputFile(): ?string
+    {
+        return $this->outputFile;
+    }
+
     private function setOnlyRector(?string $rector): void
     {
         if ($rector) {
diff --git a/src/Configuration/Option.php b/src/Configuration/Option.php
index 7a7b592f93c9..de8e2bc5716f 100644
--- a/src/Configuration/Option.php
+++ b/src/Configuration/Option.php
@@ -74,5 +74,5 @@ final class Option
     /**
      * @var string
      */
-    public const DUMP = 'dump';
+    public const OPTION_OUTPUT_FILE = 'output-file';
 }
diff --git a/src/Console/Command/ProcessCommand.php b/src/Console/Command/ProcessCommand.php
index 6034423ed4ce..fd5207d40e06 100644
--- a/src/Console/Command/ProcessCommand.php
+++ b/src/Console/Command/ProcessCommand.php
@@ -134,6 +134,7 @@ protected function configure(): void
             InputOption::VALUE_NONE,
             'See diff of changes, do not save them to files.'
         );
+
         $this->addOption(
             Option::OPTION_AUTOLOAD_FILE,
             'a',
@@ -177,6 +178,13 @@ protected function configure(): void
             InputOption::VALUE_NONE,
             'Hide progress bar. Useful e.g. for nicer CI output.'
         );
+
+        $this->addOption(
+            Option::OPTION_OUTPUT_FILE,
+            null,
+            InputOption::VALUE_REQUIRED,
+            'Location for file to dump result in. Useful for Docker or automated processes'
+        );
     }
 
     protected function execute(InputInterface $input, OutputInterface $output): int
diff --git a/src/Console/Output/ConsoleOutputFormatter.php b/src/Console/Output/ConsoleOutputFormatter.php
index c59f5cec173c..435c46de5fbe 100644
--- a/src/Console/Output/ConsoleOutputFormatter.php
+++ b/src/Console/Output/ConsoleOutputFormatter.php
@@ -7,6 +7,7 @@
 use Nette\Utils\Strings;
 use Rector\Application\ErrorAndDiffCollector;
 use Rector\Configuration\Configuration;
+use Rector\Configuration\Option;
 use Rector\Contract\Console\Output\OutputFormatterInterface;
 use Rector\NodeTypeResolver\Node\AttributeKey;
 use Rector\PhpParser\Printer\BetterStandardPrinter;
@@ -49,6 +50,15 @@ public function __construct(
 
     public function report(ErrorAndDiffCollector $errorAndDiffCollector): void
     {
+        if ($this->configuration->getConfigFilePath()) {
+            $this->symfonyStyle->error(sprintf(
+                'Option "--%s" can be used only with "--%s %s"',
+                Option::OPTION_OUTPUT_FILE,
+                Option::OPTION_OUTPUT_FORMAT,
+                'json'
+            ));
+        }
+
         $this->reportFileDiffs($errorAndDiffCollector->getFileDiffs());
         $this->reportErrors($errorAndDiffCollector->getErrors());
         $this->reportRemovedFilesAndNodes($errorAndDiffCollector);
diff --git a/src/Console/Output/JsonOutputFormatter.php b/src/Console/Output/JsonOutputFormatter.php
index db953e220a91..58d7fe93195d 100644
--- a/src/Console/Output/JsonOutputFormatter.php
+++ b/src/Console/Output/JsonOutputFormatter.php
@@ -4,6 +4,7 @@
 
 namespace Rector\Console\Output;
 
+use Nette\Utils\FileSystem;
 use Nette\Utils\Json;
 use Rector\Application\ErrorAndDiffCollector;
 use Rector\Configuration\Configuration;
@@ -89,6 +90,11 @@ public function report(ErrorAndDiffCollector $errorAndDiffCollector): void
 
         $json = Json::encode($errorsArray, Json::PRETTY);
 
-        $this->symfonyStyle->writeln($json);
+        $outputFile = $this->configuration->getOutputFile();
+        if ($outputFile !== null) {
+            FileSystem::write($outputFile, $json . PHP_EOL);
+        } else {
+            $this->symfonyStyle->writeln($json);
+        }
     }
 }