✨ Added support for response formats

README.md

@@ -2,7 +2,7 @@
 
 ![Grok PHP Client](assets/images/grok-client.png)
 
-**A lightweight, framework-agnostic PHP client for interacting with Grok AI APIs.**  
+**A lightweight, framework-agnostic PHP client for interacting with Grok AI APIs.**
 Supports **PHP 8.2+**, built with **OOP best practices**, and **fully type-safe**.
 
 [![Latest Version](https://img.shields.io/packagist/v/grok-php/client)](https://packagist.org/packages/grok-php/client)
@@ -22,6 +22,7 @@ Supports **PHP 8.2+**, built with **OOP best practices**, and **fully type-safe*
   - [Advanced Configuration](#advanced-configuration)
 - [Available Grok AI Models](#available-grok-ai-models)
 - [Streaming Responses](#streaming-responses)
+- [Response format](#response-format)
 - [Error Handling](#error-handling)
 - [Testing](#testing)
 - [Security](#security)
@@ -34,10 +35,10 @@ Supports **PHP 8.2+**, built with **OOP best practices**, and **fully type-safe*
 
 ![Grok PHP Client Demo](assets/images/demo.gif)
 
-- **Easy Integration** – Seamlessly connects with Grok AI APIs.  
-- **Modern PHP Features** – Utilizes PHP 8.2+ features like enums and traits.  
-- **Framework Agnostic** – Works with any PHP project, CLI scripts, or web applications.  
-- **Streaming Support** – Built-in support for real-time responses.  
+- **Easy Integration** – Seamlessly connects with Grok AI APIs.
+- **Modern PHP Features** – Utilizes PHP 8.2+ features like enums and traits.
+- **Framework Agnostic** – Works with any PHP project, CLI scripts, or web applications.
+- **Streaming Support** – Built-in support for real-time responses.
 - **Lightweight & Efficient** – Optimized with PSR-4 autoloading and minimal dependencies.
 
 ---
@@ -139,7 +140,7 @@ $messages = [
 // Custom API settings
 $options = new ChatOptions(
     model: Model::GROK_2_LATEST,
-    temperature: 1.2, 
+    temperature: 1.2,
     stream: false
 );
 
@@ -151,8 +152,8 @@ echo "AI Says: " . $response['choices'][0]['message']['content'];
 
 ## **Available Grok AI Models**
 
-Grok AI offers multiple models optimized for different use cases.  
-These models are available in the `Model` enum inside our package:  
+Grok AI offers multiple models optimized for different use cases.
+These models are available in the `Model` enum inside our package:
 📄 `src/Enums/Model.php`
 
 | Model Enum                   | API Model Name       | Description                                         |
@@ -172,7 +173,7 @@ These models are available in the `Model` enum inside our package:
 
 ## **Streaming Responses**
 
-The Grok API supports streaming responses for real-time interaction.  
+The Grok API supports streaming responses for real-time interaction.
 Enable it by setting `stream: true`:
 
 ```php
@@ -183,9 +184,20 @@ Streaming can be useful for chatbots, real-time applications, and CLI assistants
 
 ---
 
+## **Response format**
+
+The Grok API supports setting a response format, also refered to structured outputs, for the `grok-2-1212` model.
+
+```php
+$options = new ChatOptions(model: Model::GROK_2_1212, temperature: 0.7, stream: false, responseFormat: ['type' => 'json_object']);
+$response = $client->chat($messages, $options);
+```
+
+---
+
 ## **Error Handling**
 
-This package includes built-in error handling with a dedicated exception class.  
+This package includes built-in error handling with a dedicated exception class.
 Common errors and their messages:
 
 | Error Type         | HTTP Code | Message |
@@ -221,7 +233,7 @@ vendor/bin/phpunit
 
 ## **Security**
 
-If you discover a security vulnerability, please report it via email:  
+If you discover a security vulnerability, please report it via email:
 📩 [thefeqy@gmail.com](mailto:thefeqy@gmail.com)
 
 ---

src/Clients/GrokClient.php

@@ -69,6 +69,7 @@ public function chat(array $messages, ChatOptions $options): array
             'messages' => $messages,
             'temperature' => $options->temperature,
             'stream' => $options->stream,
+            'response_format' => $options->responseFormat,
         ]);
     }
 

src/Config/ChatOptions.php

@@ -16,16 +16,21 @@ class ChatOptions
 
     public bool $stream;
 
+    public ?array $responseFormat;
+
     public function __construct(
         ?Model $model = null,
         ?float $temperature = null,
-        ?bool $stream = null
+        ?bool $stream = null,
+        ?array $responseFormat = null
     ) {
 
         $this->model = $model ?: Model::tryFrom(DefaultConfig::MODEL->value) ?: Model::GROK_2;
 
         $this->temperature = $temperature ?? (float) DefaultConfig::TEMPERATURE->value;
 
         $this->stream = $stream ?? filter_var(DefaultConfig::STREAMING->value, FILTER_VALIDATE_BOOLEAN);
+
+        $this->responseFormat = $responseFormat ? (array) $responseFormat : null;
     }
 }

src/Testing/ClientFake.php

@@ -12,7 +12,7 @@ class ClientFake
      *
      * @throws JsonException
      */
-    public static function fakeSuccessResponse(): Response
+    public static function fakeSuccessResponse(?array $data = null): Response
     {
         return new Response(200, ['Content-Type' => 'application/json'], json_encode([
             'id' => '7c51076a-e4cc-4855-8dbe-66c26818e35f',
@@ -24,7 +24,7 @@ public static function fakeSuccessResponse(): Response
                     'index' => 0,
                     'message' => [
                         'role' => 'assistant',
-                        'content' => json_encode([
+                        'content' => json_encode($data ?? [
                             'framework_name' => 'Laravel',
                             'release_date' => '2011',
                             'programming_language' => 'PHP',

tests/Feature/GrokClientTest.php

@@ -58,4 +58,30 @@ public function test_chat_request_returns_response(): void
         $this->assertSame('2011', $decodedContent['release_date']);
         $this->assertSame('PHP', $decodedContent['programming_language']);
     }
+
+    public function test_chat_request_returns_response_in_specific_format(): void
+    {
+        $this->client->setHttpClient(new Client(['handler' => HandlerStack::create(new MockHandler([
+            ClientFake::fakeSuccessResponse([
+                'name' => 'Taylor',
+                'city' => 'Little Rock'
+            ]),
+        ]))]));
+
+        $messages = [
+            ['role' => 'system', 'content' => 'You are a helpful assistant.'],
+            ['role' => 'user', 'content' => 'Return a json object with a random name (string) and random city (string).'],
+        ];
+
+        $options = new ChatOptions(model: Model::GROK_2_1212, temperature: 0.7, stream: false, responseFormat: ['type' => 'json_object']);
+        $response = $this->client->chat($messages, $options);
+        $content = $response['choices'][0]['message']['content'];
+        $decodedContent = json_decode($response['choices'][0]['message']['content'], true, 512, JSON_THROW_ON_ERROR);
+
+        $this->assertJson($content);
+        $this->assertArrayHasKey('name', $decodedContent);
+        $this->assertArrayHasKey('city', $decodedContent);
+        $this->assertSame('Taylor', $decodedContent['name']);
+        $this->assertSame('Little Rock', $decodedContent['city']);
+    }
 }