API Automation & Contract Testing
Master API automation with REST, GraphQL, and contract testing. Learn Postman, RestAssured, Pact, and build robust API test suites for modern microservices architectures.
Membership required
Join Membership to unlock human reviews of your work, 21 advanced specializations, and higher coach limits. 1:1 mentorship comes with Pro later.
The foundation of modern quality. Master the Testing Pyramid, understand the shift from REST to GraphQL/gRPC, and protect your microservices with Consumer-Driven Contract Testing.
1. The Logic Layer
2. Beyond JSON: GraphQL & gRPC
3. Contract Testing
4. Conclusion
Write the code. Learn to build robust API Clients using Axios and graphql-request, implement JWT authentication hooks, and validate response schemas with Zod.
1. The API Client Wrapper
2. Automating GraphQL
3. Conclusion
Scale Postman from a manual tool to an automated powerhouse. Master Newman for headless execution, generate stunning reports with htmlextra, and decouple frontend testing using Postman Mock Servers.
1. Collection Architecture
2. Headless Automation
3. Conclusion
Select the right tool for the job. Master RestAssured for Java ecosystems, leverage Playwright's APIRequestContext for Unified TypeScript testing, and use k6 for high-concurrency functional checks.
1. RestAssured (Java)
2. Playwright API (TypeScript)
3. k6 Functional Testing
4. Conclusion
Validate the "Shape" of your data. Master JSON Schema for language-agnostic contracts, and use Zod for strict runtime validation in TypeScript to catch "Type-Mismatch" bugs before looking at a single value.
1. The Contract (JSON Schema)
2. The Enforcer (Zod)
3. Conclusion
Secure the gate. Master the OAuth 2.1 standard, understand the death of Implicit Flow, and learn to automate the "Client Credentials" handshake so your tests never fail due to a stale token.
1. The Modern Standard (OAuth 2.1)
2. Automating the Handshake
3. JWT Security Auditing
4. Conclusion
Multiply your coverage. Learn to use Parameterized Tests in Playwright/Jest to run thousands of variations from a single script, and discover Property-Based Testing (Fuzzing) to find edge cases you never imagined.
1. The Matrix (CSV/JSON)
2. Beyond Examples
3. Conclusion
Stop the "Integration Hell". Learn how to verify microservice compatibility without spinning up 50 containers. Master Consumer-Driven Contracts (Pact) and the newer Bi-Directional Contract Testing using OpenAPI specs.
1. The Integration Trap
2. The Pact Workflow
3. Modern Scaling (Bi-Directional)
4. Conclusion
Go beyond "One-Shot" tests. Learn how to correlate data across multiple requests to simulate complex user journeys (Signup -> Login -> Purchase) and master state management strategies to prevent flaky tests.
1. The Chain Reaction
2. Asynchronous Challenges
3. Architectural Cleanliness
4. Conclusion
Graduate from scripting to engineering. Build a scalable, layered API automation framework using TypeScript. Learn to auto-generate fully typed clients from OpenAPI specs, implement the Factory pattern for test data, and integrate Allure reporting into GitHub Actions.