Learn how to design, execute and automate API testing using Postman, REST principles, authentication, contract testing and AI-assisted workflows.
Learn through structured written lessons, worked examples, practical exercises, templates, collections, and a portfolio-building final project.
A practical course for testers, QA analysts, automation engineers and career changers who want to test APIs properly — the layer where most real integration bugs live.
Move beyond the UI and test the APIs behind the application.
Build fast, reliable automated API checks and CI pipelines.
Validate data, contracts and integrations with confidence.
Add professional API testing depth to your toolkit.
Learn one of the most in-demand QA skills from scratch.
Test integrations early and shift API quality left.
10 professionally designed modules — 55 lessons — taking you from API fundamentals to a complete, automated API test suite.
What an API is, the client–server model, REST principles, and where API testing fits in the delivery lifecycle.
GET, POST, PUT, PATCH, DELETE, idempotency, headers, and reading status codes like a tester.
Read, validate and assert on JSON and XML payloads, schemas, and nested data structures.
Collections, environments, variables, scripts, tests, data-driven runs and the Collection Runner.
API keys, Basic auth, Bearer tokens, OAuth 2.0, and testing common API security risks.
Designing a full REST test strategy: positive, negative, boundary, CRUD flows and end-to-end journeys.
Testing GraphQL queries and mutations, and using contract testing to catch breaking changes early.
Run Postman collections from the CLI with Newman, integrate into CI/CD, and produce reports.
Use AI to accelerate endpoint analysis, test idea generation, assertions and documentation — responsibly.
Build a complete API test suite for a sample application: collections, automated execution, reporting and documentation.
Everything you need to practise and to reuse on the job.
Ready-to-import collections you build on throughout the course.
Real API specifications to explore and test against.
Status codes, methods, headers and assertions at a glance.
Sample payloads for practising parsing and validation.
API keys, Basic, Bearer and OAuth 2.0 explained for testers.
A reusable strategy to plan coverage for any API.
CLI and CI/CD templates for automated collection runs.
Curated prompts for endpoint analysis, tests and docs.
Assessed through hands-on practice and a portfolio project, not a traditional exam.
Short checks in every lesson to lock in the concepts.
Hands-on tasks and mini challenges in every lesson.
Build a complete, automated API test suite for a sample app.
Awarded when you complete the course activities.
Build a complete API test suite for a sample application — including documentation, collections, automated execution and reporting:
Complete the course activities and final portfolio project to earn your Inside STLC Academy – API Testing Masterclass Certificate of Completion.
No. The course starts from API fundamentals. Postman is largely no-code, and the small amount of JavaScript used in scripts and Newman is fully explained.
No. Everything is taught with the free Postman app and free public APIs, so you can complete the whole course at no extra cost.
Yes. It is beginner-friendly but goes deep enough to make experienced manual testers confident with professional API testing.
Yes. You earn the Inside STLC Academy – API Testing Masterclass certificate after completing the course activities and final project.
No. You are assessed through practical exercises, knowledge checks, and a final portfolio project rather than a traditional exam.
Join Inside STLC Academy and build a professional, automated API testing skillset.