diff --git a/config/routes.php b/config/routes.php
index 95323cf..473b1bf 100644
--- a/config/routes.php
+++ b/config/routes.php
@@ -116,6 +116,9 @@ static function (ResponseFactoryInterface $responseFactory, ValidatorInterface $
             Route::post('/curl/build')
                 ->action([InspectController::class, 'buildCurl'])
                 ->name('curl/build'),
+            Route::get('/config/merge-plan')
+                ->action([\Yiisoft\Yii\Debug\Api\Controller\ConfigController::class, 'read'])
+                ->name('config/merge-plan'),
             Group::create('/git')
                 ->namePrefix('/git')
                 ->routes(
diff --git a/src/Controller/ConfigController.php b/src/Controller/ConfigController.php
new file mode 100644
index 0000000..cfe1407
--- /dev/null
+++ b/src/Controller/ConfigController.php
@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Yii\Debug\Api\Controller;
+
+use Exception;
+use Psr\Http\Message\ResponseInterface;
+use Yiisoft\Aliases\Aliases;
+use Yiisoft\DataResponse\DataResponseFactoryInterface;
+use Yiisoft\Yii\Debug\Api\Inspector\Command\BashCommand;
+
+final class ConfigController
+{
+    public function __construct(
+        private DataResponseFactoryInterface $responseFactory,
+    ) {
+    }
+
+    public function read(Aliases $aliases): ResponseInterface
+    {
+        $command = new BashCommand($aliases, [
+            'composer',
+            'yii-config-merge-plan',
+        ]);
+        $output = $command->run()->getResult();
+        $mergePlanPath = substr($output, 0, strpos($output, 'Xdebug: [Step Debug]') ?: -1);
+
+        if (!file_exists($mergePlanPath)) {
+            throw new Exception(
+                sprintf(
+                    'Could not find composer.json by the path "%s".',
+                    $mergePlanPath,
+                )
+            );
+        }
+
+        $content = require $mergePlanPath;
+        $rootAlias = $aliases->get('@root');
+
+        $result = [
+            'path' => substr($mergePlanPath, strlen($rootAlias) + 1),
+            'data' => $content,
+        ];
+
+        return $this->responseFactory->createResponse($result);
+    }
+}