diff --git a/README.md b/README.md
index b869810..bd81b0d 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ Add a new disk to your `filesystems.php` config
 
 The Google Client uses a few methods to determine how it should authenticate with the Google API.
 
-1. If you specify a `key_file` in the disk config, that json credentials file will be used.
+1. If you specify a path in the key `key_file` in  disk config, that json credentials file will be used.
 2. If the `GOOGLE_APPLICATION_CREDENTIALS` env var is set, it will use that.
    ```php
    putenv('GOOGLE_APPLICATION_CREDENTIALS=/path/to/service-account.json');
@@ -55,6 +55,20 @@ The Google Client uses a few methods to determine how it should authenticate wit
 
 4. If running in **Google App Engine**, the built-in service account associated with the application will be used.
 5. If running in **Google Compute Engine**, the built-in service account associated with the virtual machine instance will be used.
+6. If you want to authenticate directly without using a json file, you can specify an array for `key_file` in disk config with this data:
+    ```php
+    'key_file' => [
+        'type' => env('GOOGLE_CLOUD_ACCOUNT_TYPE'),
+        'private_key_id' => env('GOOGLE_CLOUD_PRIVATE_KEY_ID'),
+        'private_key' => env('GOOGLE_CLOUD_PRIVATE_KEY'),
+        'client_email' => env('GOOGLE_CLOUD_CLIENT_EMAIL'),
+        'client_id' => env('GOOGLE_CLOUD_CLIENT_ID'),
+        'auth_uri' => env('GOOGLE_CLOUD_AUTH_URI'),
+        'token_uri' => env('GOOGLE_CLOUD_TOKEN_URI'),
+        'auth_provider_x509_cert_url' => env('GOOGLE_CLOUD_AUTH_PROVIDER_CERT_URL'),
+        'client_x509_cert_url' => env('GOOGLE_CLOUD_CLIENT_CERT_URL'),
+    ],
+    ```
 
 ### Public URLs
 
diff --git a/src/GoogleCloudStorageServiceProvider.php b/src/GoogleCloudStorageServiceProvider.php
index a6e83fc..4dce843 100644
--- a/src/GoogleCloudStorageServiceProvider.php
+++ b/src/GoogleCloudStorageServiceProvider.php
@@ -64,10 +64,8 @@ public function boot()
         $factory = $this->app->make('filesystem');
         /* @var FilesystemManager $factory */
         $factory->extend('gcs', function ($app, $config) {
-            $storageClient = new StorageClient([
-                'projectId' => $config['project_id'],
-                'keyFilePath' => array_get($config, 'key_file'),
-            ]);
+            $storageClient = $this->createClient($config);
+
             $bucket = $storageClient->bucket($config['bucket']);
             $pathPrefix = array_get($config, 'path_prefix');
             $storageApiUri = array_get($config, 'storage_api_uri');
@@ -78,6 +76,28 @@ public function boot()
         });
     }
 
+    /**
+     * Create a new StorageClient
+     *
+     * @param  mixed $config
+     * @return \Google\Cloud\Storage\StorageClient
+     */
+    private function createClient($config)
+    {
+        if (is_string(array_get($config, 'key_file'))) {
+            return new StorageClient([
+                'projectId' => $config['project_id'],
+                'keyFilePath' => array_get($config, 'key_file'),
+            ]);
+        }
+
+        return new StorageClient([
+            'projectId' => $config['project_id'],
+            'keyFile' => array_merge([
+                "project_id" => $config['project_id']
+            ], array_get($config, 'key_file', [])
+        ]);
+    }
 
     /**
      * Register bindings in the container.