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Pact Foundation · GitHub
Pact Foundation
The cross-language distributed contract testing framework.
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.
Pinned
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Developer Relations @ Pact - Your map to the Pact landscape for all-comers (maintainers, contributors, users, newbies)
45
7
Describes the pact format and verification specifications
307
27
Reference implementations for the pact specifications
Rust
100
50
Enables your consumer driven contracts workflow
Ruby
736
187
In-process mock server for matching HTTP requests and generating responses from a pact file
Rust
8
2
JS version of Pact. Pact is a contract testing framework for HTTP APIs and non-HTTP asynchronous messaging systems.
TypeScript
1.7k
353
Repositories
Showing 10 of 86 repositories
pact-foundation/pact-broker-docker’s past year of commit activity
Shell
115
MIT
110
2
8
Updated Dec 27, 2025
pact-foundation/pact-workshop-message’s past year of commit activity
Makefile
0
0
3
10
Updated Dec 27, 2025
pact-docker-cli
Public
Dockerised Amalgamated Pact CLI - Broker Client / Mock Server / Provider Verifier / Stub Server / Plugin / PactFlow AI
pact-foundation/pact-docker-cli’s past year of commit activity
Shell
14
MIT
13
3
5
Updated Dec 27, 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
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
pact-foundation/pact-provider-verifier’s past year of commit activity
Ruby
33
MIT
24
1
3
Updated Dec 26, 2025
pact_broker-client
Public
A Ruby and CLI client for the Pact Broker. Publish and retrieve pacts and verification results.
pact-foundation/pact_broker-client’s past year of commit activity
pact-foundation/pact-message-ruby’s past year of commit activity
Ruby
10
MIT
10
1
3
Updated Dec 26, 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
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
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