Contract Testing (Pact, Docker, GitHub Actions, TypeScript, Node.js) overview

A consumer-driven contract testing platform using Pact to verify that API producers and consumers agree on request/response schemas without requiring full integration environments. Contracts are generated by consumer tests, published to a Pact Broker running in Docker, and verified by provider CI pipelines in GitHub Actions. TypeScript provides type-safe contract definitions that mirror production API types. Node.js serves as the runtime for both consumer and provider verification. Ideal for microservice architectures where teams deploy independently but must maintain API compatibility. The tradeoff is the overhead of maintaining the Pact Broker and educating all teams on contract-first development practices.