diff --git a/Generator/Generator.php b/Generator/Generator.php
index e8dcbc7..f3f1180 100644
--- a/Generator/Generator.php
+++ b/Generator/Generator.php
@@ -45,8 +45,13 @@ public function generate(): void
         );
 
         $filePath = $this->docsFolder.'index.html';
+        $filePathSpecification = $this->docsFolder.'specification.json';
 
         $fs = new Filesystem();
         $fs->dumpFile($filePath, $docs);
+
+        /** @var string $swaggerConfigAsJson */
+        $swaggerConfigAsJson = json_encode($swaggerConfig, \JSON_UNESCAPED_UNICODE | \JSON_UNESCAPED_SLASHES | \JSON_PRETTY_PRINT | \JSON_THROW_ON_ERROR);
+        $fs->dumpFile($filePathSpecification, $swaggerConfigAsJson);
     }
 }
diff --git a/Tests/Generator/GeneratorTest.php b/Tests/Generator/GeneratorTest.php
index 6a7a8b6..8e4df9c 100644
--- a/Tests/Generator/GeneratorTest.php
+++ b/Tests/Generator/GeneratorTest.php
@@ -24,6 +24,7 @@ final class GeneratorTest extends TestCase
     private string $docsFolder = __DIR__.'/Fixtures/';
 
     private string $docsFile = __DIR__.'/Fixtures/index.html';
+    private string $specificationFile = __DIR__.'/Fixtures/specification.json';
 
     /** @var Environment|MockObject */
     private Environment|MockObject $twig;
@@ -41,6 +42,7 @@ protected function setUp(): void
         $this->parser = $this->createMock(ConfigParser::class);
         $this->filesystem = new Filesystem();
         $this->filesystem->dumpFile($this->docsFile, '');
+        $this->filesystem->dumpFile($this->specificationFile, '');
 
         $this->generator = new Generator($this->twig, $this->parser, $this->docsFolder);
     }
@@ -54,11 +56,12 @@ protected function tearDown(): void
         );
 
         $this->filesystem->remove($this->docsFile);
+        $this->filesystem->remove($this->specificationFile);
     }
 
     public function testGenerate(): void
     {
-        $swaggerConfig = ['open api config'];
+        $swaggerConfig = ['open api config' => 'value'];
 
         $this->parser
             ->expects(self::once())
@@ -76,6 +79,13 @@ public function testGenerate(): void
 
         $this->generator->generate();
 
+        $swaggerConfigAsJson = <<<'EOT'
+{
+    "open api config": "value"
+}
+EOT;
+
         self::assertStringEqualsFile($this->docsFolder.'index.html', $docs);
+        self::assertStringEqualsFile($this->docsFolder.'specification.json', $swaggerConfigAsJson);
     }
 }