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Pact Foundation

The cross-language distributed contract testing framework.
README.md

Pact

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.

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  1. roadmap roadmap Public

    Developer Relations @ Pact - Your map to the Pact landscape for all-comers (maintainers, contributors, users, newbies)

    45 7

  2. pact-specification pact-specification Public

    Describes the pact format and verification specifications

    307 28

  3. pact-reference pact-reference Public

    Reference implementations for the pact specifications

    Rust 100 50

  4. pact_broker pact_broker Public

    Enables your consumer driven contracts workflow

    Ruby 733 186

  5. pact-core-mock-server pact-core-mock-server Public

    In-process mock server for matching HTTP requests and generating responses from a pact file

    Rust 8 2

  6. pact-js pact-js Public

    JS version of Pact. Pact is a contract testing framework for HTTP APIs and non-HTTP asynchronous messaging systems.

    TypeScript 1.7k 354

Repositories

Showing 10 of 86 repositories
  • pact-reference Public

    Reference implementations for the pact specifications

    pact-foundation/pact-reference’s past year of commit activity
    Rust 100 MIT 50 46 (2 issues need help) 2 Updated Nov 28, 2025
  • pact-js-core Public

    Core binaries for pact-js, a Contract Testing Framework. NOTE: If you are looking to do Pact contract testing in node, you almost certainly want pact-js, not pact-node.

    pact-foundation/pact-js-core’s past year of commit activity
    TypeScript 152 MIT 79 5 (1 issue needs help) 1 Updated Nov 28, 2025
  • pact-python Public

    Python version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project.

    pact-foundation/pact-python’s past year of commit activity
    Python 632 MIT 145 17 (3 issues need help) 8 Updated Nov 27, 2025
  • jest-pact Public

    A Pact adaptor for to allow you to easily run tests with Jest

    pact-foundation/jest-pact’s past year of commit activity
    TypeScript 82 MIT 12 4 13 Updated Nov 27, 2025
  • pact-php Public

    PHP version of Pact. Enables consumer driven contract testing, providing a mock service and DSL for the consumer project, and interaction playback and verification for the service provider project

    pact-foundation/pact-php’s past year of commit activity
    PHP 291 Apache-2.0 92 3 6 Updated Nov 27, 2025
  • pact-standalone Public

    Standalone Amalgamated Pact CLI - Broker Client / Mock Server / Provider Verifier / Stub Server / Plugin

    pact-foundation/pact-standalone’s past year of commit activity
    Ruby 43 MIT 36 6 (2 issues need help) 9 Updated Nov 26, 2025
  • pact-event-bot Public
    pact-foundation/pact-event-bot’s past year of commit activity
    TypeScript 2 MIT 1 1 10 Updated Nov 26, 2025
  • pact-js Public

    JS version of Pact. Pact is a contract testing framework for HTTP APIs and non-HTTP asynchronous messaging systems.

    pact-foundation/pact-js’s past year of commit activity
    TypeScript 1,720 354 97 (13 issues need help) 9 Updated Nov 26, 2025
  • pact-broker-chart Public

    This repository houses the Pact Broker Helm Chart

    pact-foundation/pact-broker-chart’s past year of commit activity
    Smarty 14 MIT 23 1 2 Updated Nov 25, 2025
  • pact-workshop-dotnet Public
    pact-foundation/pact-workshop-dotnet’s past year of commit activity
    C# 7 Apache-2.0 3 1 0 Updated Nov 25, 2025
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