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Fast, easy and reliable testing for your APIs and microservices during development
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What is Pact?

It is a code-first tool for testing HTTP and message integrations using contract tests. Contract tests assert that inter-application messages conform to a shared understanding that is documented in a contract. Without contract testing, the only way to ensure that applications will work correctly together is by using expensive and brittle integration tests.
Pact is a tool in the Microservices Tools category of a tech stack.
Pact is an open source tool with 218 GitHub stars and 95 GitHub forks. Here’s a link to Pact's open source repository on GitHub

Who uses Pact?

10 companies reportedly use Pact in their tech stacks, including main, RatePAY GmbH, and

28 developers on StackShare have stated that they use Pact.

Pact Integrations

JavaScript, Python, PHP, Ruby, and Golang are some of the popular tools that integrate with Pact. Here's a list of all 7 tools that integrate with Pact.

Pact's Features

  • Support for JavaScript, JVM, .NET, Python, Go, Ruby, PHP, Swift and more
  • Get fast, reliable feedback on the compatibility of your integrations
  • Ensures all your services are compatible with each other before you deploy

Pact Alternatives & Comparisons

What are some alternatives to Pact?
Rather than having to commit/push every time you want test out the changes you are making to your .github/workflows/ files (or for any changes to embedded GitHub actions), you can use this tool to run the actions locally. The environment variables and filesystem are all configured to match what GitHub provides.
It is the only complete API development environment, used by nearly five million developers and more than 100,000 companies worldwide.
Amazon API Gateway
Amazon API Gateway handles all the tasks involved in accepting and processing up to hundreds of thousands of concurrent API calls, including traffic management, authorization and access control, monitoring, and API version management.
Istio is an open platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio's control plane provides an abstraction layer over the underlying cluster management platform, such as Kubernetes, Mesos, etc.
Insomnia REST Client
Insomnia is a powerful REST API Client with cookie management, environment variables, code generation, and authentication for Mac, Window, and Linux.
See all alternatives

Pact's Followers
55 developers follow Pact to keep up with related blogs and decisions.