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Fast, easy and reliable testing for your APIs and microservices.

Pact PHP Demo

Pact is the de-facto API contract testing tool. Replace expensive and brittle end-to-end integration tests with fast, reliable and easy to debug unit tests.

  • ⚡ Lightning fast
  • 🎈 Effortless full-stack integration testing - from the front-end to the back-end
  • 🔌 Supports HTTP/REST and event-driven systems
  • 🛠️ Configurable mock server
  • 😌 Powerful matching rules prevents brittle tests
  • 🤝 Integrates with Pact Broker / PactFlow for powerful CI/CD workflows
  • 🔡 Supports 12+ languages

Why use Pact?

Contract testing with Pact lets you:

  • ⚡ Test locally
  • 🚀 Deploy faster
  • ⬇️ Reduce the lead time for change
  • 💰 Reduce the cost of API integration testing
  • 💥 Prevent breaking changes
  • 🔎 Understand your system usage
  • 📃 Document your APIs for free
  • 🗄 Remove the need for complex data fixtures
  • 🤷‍♂️ Reduce the reliance on complex test environments

Watch our series on the problems with end-to-end integrated tests, and how contract testing can help.



This readme offers a basic introduction to the library. The full documentation for Pact PHP and the rest of the framework is available at

Need Help


composer require pact-foundation/pact-php --dev

# 🚀 now write some tests!

Looking for the previous stable 9.x.x release?


PHP 8.1+ as of pact-php v10

Do Not Track

In order to get better statistics as to who is using Pact, we have an anonymous tracking event that triggers when Pact installs for the first time. The only things we track are your type of OS, and the version information for the package being installed. No PII data is sent as part of this request. You can disable tracking by setting the environment variable PACT_DO_NOT_TRACK=1:



Writing a Consumer test

namespace App\Tests;

use App\Service\HttpClientService;
use PhpPact\Consumer\InteractionBuilder;
use PhpPact\Consumer\Matcher\Matcher;
use PhpPact\Consumer\Model\ConsumerRequest;
use PhpPact\Consumer\Model\ProviderResponse;
use PhpPact\Standalone\MockService\MockServerConfig;
use PHPUnit\Framework\TestCase;

class ConsumerServiceHelloTest extends TestCase
public function testGetHelloString(): void
$matcher = new Matcher();

// Create your expected request from the consumer.
$request = new ConsumerRequest();
->addHeader('Content-Type', 'application/json');

// Create your expected response from the provider.
$response = new ProviderResponse();
->addHeader('Content-Type', 'application/json')
'message' => $matcher->term('Hello, Bob', '(Hello, )[A-Za-z]+')

// Create a configuration that reflects the server that was started. You can create a custom MockServerConfigInterface if needed.
$config = new MockServerConfig();
if ($logLevel = \getenv('PACT_LOGLEVEL')) {
$builder = new InteractionBuilder($config);
->uponReceiving('A get request to /hello/{name}')
->willRespondWith($response); // This has to be last. This is what makes FFI calls to register the interaction and start the mock server.

$service = new HttpClientService($config->getBaseUri()); // Pass in the URL to the Mock Server.
$helloResult = $service->getHelloString('Bob'); // Make the real API request against the Mock Server.
$verifyResult = $builder->verify(); // This will verify that the interactions took place.

$this->assertTrue($verifyResult); // Make your assertions.
$this->assertEquals('Hello, Bob', $helloResult);

You can see (and run) the full version of this in ./examples/json, as well as other examples in the parent folder.

To run the examples

  1. Clone the repo
  2. Go to the repo cd pact-php
  3. Install all dependencies composer install

Run a single example

  1. Change into the required example folder cd examples/json
  2. Run the example - phpunit

Run all examples

  1. Change into the examples folder cd examples
  2. Install all the examples phpunit


Verifying a Provider

A provider test takes one or more pact files (contracts) as input, and Pact verifies that your provider adheres to the contract. In the simplest case, you can verify a provider as per below using a local pact file, although in practice you would usually use a Pact Broker to manage your contracts and CI/CD workflow.

namespace App\Tests;

use GuzzleHttp\Psr7\Uri;
use PhpPact\Standalone\ProviderVerifier\Model\VerifierConfig;
use PhpPact\Standalone\ProviderVerifier\Verifier;
use PhpPactTest\Helper\PhpProcess;
use PHPUnit\Framework\TestCase;

class PactVerifyTest extends TestCase
private PhpProcess $process;

protected function setUp(): void
$this->process = new PhpProcess(__DIR__ . '/path/to/public/');

protected function tearDown(): void

* This test will run after the web server is started.
public function testPactVerifyConsumer()
$config = new VerifierConfig();
->setName('jsonProvider') // Providers name to fetch.
->setStateChangeUrl(new Uri(sprintf('http://localhost:%d/pact-change-state', $this->process->getPort())))
if ($level = \getenv('PACT_LOGLEVEL')) {

$verifier = new Verifier($config);
$verifier->addFile(__DIR__ . '/path/to/pacts/jsonConsumer-jsonProvider.json');

$verifyResult = $verifier->verify();


It's best to run Pact verification tests as part of your unit testing suite, so you can readily access stubbing, IaC and other helpful tools.



VersionStatusSpec CompatibilityPHP CompatibilityInstall
10.xAlpha1, 1.1, 2, 3, 4^8.1See installation
9.xStable1, 1.1, 2, 3*^8.09xx
8.xDeprecated1, 1.1, 2, 3*^7.4|^8.0
7.xDeprecated1, 1.1, 2, 3*^7.3
6.xDeprecated1, 1.1, 2, 3*^7.2
5.xDeprecated1, 1.1, 2, 3*^7.1
4.xDeprecated1, 1.1, 2^7.1
3.xDeprecated1, 1.1, 2^7.0
2.xDeprecated1, 1.1, 2>=7
1.xDeprecated1, 1.1>=7

* v3 support is limited to the subset of functionality required to enable language inter-operable Message support.

Supported Platforms
OSArchitectureSupportedPact-PHP Version
OSXarm649.x +
Linuxarm649.x +
Windowsx869.x -
Alpinex86_64All *
Alpinearm64All *

* For 9.x and below, supported with a workaround Ruby Standalone with Alpine.


The roadmap for Pact and Pact PHP is outlined on our main website.