API Testing Mastery is a compact, practical course for manual QA testers and anyone moving into API testing. You will begin with the language of APIs: gateways, HTTP methods, status codes, requests, payloads, authentication, and authorization. From there, you will build a working Postman collection against JSONPlaceholder, a free public practice API.
You will learn to parameterize requests with environments and variables, write pm.test assertions, test positive and negative scenarios, run collections, and understand how Newman brings API tests into automated workflows. The course then expands into the broader skills employers expect: OWASP API security risks, load and resilience testing, GraphQL and gRPC considerations, CI/CD integration, AI-assisted testing, and clear stakeholder reporting.
At the strategy level, you will explore microservice test pyramids, consumer-driven contract testing, mocking and service virtualization, chaos testing, observability, schema drift, automation-framework choices, and release quality gates. Each level includes a practical checkpoint so you can turn the exercises into a portfolio-ready Postman project and test-strategy artifact.
