API & Contract Testing
Verifying the integration surface your frontend and partners depend on.
What this engagement covers.
We build automated API test suites covering schema validation, authentication flows, error handling, and boundary conditions. For microservice architectures, consumer-driven contract testing with Pact ensures integration contracts are verified independently.
Request/response shapes validated against OpenAPI/Swagger specs.
OAuth, JWT, API key, and session-based auth flows covered.
Consumer-driven contracts verified independently of service deployment.
4xx/5xx handling, rate limiting, and edge-case inputs all exercised.
API tests run in pipeline as a blocking gate on every service deploy.
Tools and technologies.
API engagements catch the most expensive class of defect: a downstream consumer breaking because an upstream contract changed silently. The toolkit covers request validation, contract checks, and CI gates.
Tools
Technologies
Frequently asked questions
What is contract testing?
Contract testing verifies that services and APIs which depend on each other keep their promises. With tools like Pact, a change that would break a consumer fails the test before it ships.
How is it different from normal API testing?
Functional API testing checks that an endpoint behaves correctly. Contract testing checks that a change does not silently break the partners or front ends that rely on it. We do both.
Which tools do you use?
Pact for consumer-driven contracts, REST Assured and Postman or Newman for functional API checks, and schema validation to catch breaking changes early.
Why does this matter for us?
If your product runs on integrations, a quiet contract break can take down a payment or a partner flow. Contract tests catch it before a customer does.
Make your next releaseuneventful.
Book a free 30-minute quality audit. We'll review your stack and show you exactly where the risk is hiding, no pitch deck required.