API Testing in detail using Postman - Test Automation (Udemy.com)
Master API Testing with Postman and AI - Learn with a Real-World, Production-Style API!
Created by: Gianni Bruno
Last updated March 2026
What you will learn
- You will understand what webservices & API's are, and their purpose.
- You will write comprehensive API tests in Postman using artificial intelligence (AI).
- You will gain an in-depth understanding of API testing from the basics to an advanced level.
- You will learn all about GET, POST, PUT, DELETE requests.
- You will learn how to use Postman variables to create workflows and scenarios.
- You will use real-world APIs (exclusively created and hosted by us).
- You will gain hands-on knowledge using Jenkins Continuous Integration.
- And plenty more!
Course Description
Discover everything about APIs and how to test them using Postman. This course has required hundreds of hours to design and create, ensuring you retain information and learn effectively. API testing is a crucial component of any tester's toolkit. You are taught all about APIs, how we can test them using Postman, how you can utilise artificial intelligence to generate effective tests, and much more.
What is an API?
An API (Application Programming Interface) enables software applications to interact by defining a set of access rules and protocols. It facilitates the integration of different systems, allowing developers to utilise external functionalities without understanding their complex workings.
Why do we use Postman?
Postman is an interactive tool for building, testing, and modifying APIs. It enables developers to send HTTP requests, view responses, and automate tests, thus ensuring APIs function as intended. Its user-friendly interface simplifies the complex process of API testing, making it accessible for developers at all skill levels.
Why this course?
Hundreds of hours of dedicated effort have been invested in crafting this course, meticulously refining the content to ensure that students not only grasp but also retain valuable information. With a community of more than 75,000 students enrolled on my courses, I know what works and how to present material so that you learn efficiently and effectively!
What makes this course unique?
This course utilises my own API, hosted on a dedicated site, to ensure the material remains relevant without the risk of change. Unlike many lecturers, I not only take great care about the quality of my material but also ensure the necessary course materials are in place so you derive the maximum benefit from my teaching!
Still unsure?
See what students are saying by checking out my course reviews. My courses has proudly helped students secure new jobs, gain promotions, break into new careers, and more!
Instructor Details
- 4.8 Rating
423 Reviews
Gianni Bruno
I'm a Senior SDET with 10+ years of hands-on experience building test automation frameworks across real-world teams, products and projects. I've also helped over 100,000 students, with 12,500+ reviews, learn test automation through practical Udemy courses built around real tools, real projects and job-ready skills.
I've worked across digital asset custody, blockchain-related systems, fintech, edtech, online booking, e-commerce and hospitality/POS systems. That includes testing web applications, APIs, financial workflows, backend services, reporting systems and business-critical end-to-end journeys where accuracy, reliability and data integrity matter.
My courses cover:
- Playwright, TypeScript and AI-assisted testing
- Claude, OpenAI and modern QA workflows
- API testing with Postman and REST
- Selenium WebDriver, Java and Cypress
- WebDriverIO, JavaScript and Python
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Reviews
By Tony O'Hagan on 7/27/2026
I wanted to learn Postman as I will soon be working with API's, Gianni's course was excellent. By following his course I was able to attempt to test a basic API that would eventually deployed to a client site. I was able to get familiar with headers and scripts to interrogate the API by following Gianni's steps and I was able to refer back to the course if I got stuck. Thanks Gianni for giving me the confidence to add Postman to my tool box. PS - I was even able to show seasoned Postman users a few tricks that they didn't know about via Gianni's expert tuition.
By Anonymized User on 3/27/2025
Was very good but could have more exploration wiht post bot
By Noel Ly on 2/28/2025
Amazing course. I have bought plenty of courses on Udemy, and Gianni is my favorite instructor. He is clear, thoughtful, and has given me confidence in the skills that I have learnt.
By Priyanka Mudgal on 2/26/2025
Thank you...It was really a good experience .I have first time attended his lecture n it was awesome its content, way of explanation, most importantly his interaction(Give it try..!!) even though its recorded it motived to people to try .I really enjoyed doing his challenges .
By Kashyap Mehta on 2/22/2025
I can blindly buy courses from Gianni as I'm confident it won't disappoint me to level up my craft. This course is an absolute gem for anyone looking to master API testing with Postman while exploring the power of AI (Postbot) in automation. The explanations are clear, practical, and beginner-friendly, yet packed with advanced insights. I especially loved how the course integrates real-world examples and AI-driven testing strategies, making it stand out from other Postman tutorials. The hands-on projects and challenges ensure that one truly understands and can apply what is learned. Highly recommended! I'm looking forward to more of such courses from Gianni.
By Vaggelis Gargoulakis on 11/21/2024
This is an excellent course for those who want to go from zero to hero in testing APIs using Postman. Very informative and covers everything you need to know in order to start working with Postman. Overall, I am so happy I watched this course.
By Beth D on 10/15/2024
Wow! What a useful course! You really do a good job of breaking it down and explaining it. I hope to be immediately implement the concepts I learned in this course.
By Ian Proshkovskyi on 7/2/2024
This course has exceeded all my expectations! The material is presented in an extremely detailed and clear manner. The instructor explains each topic wonderfully, making the learning process easy and engaging.
By Qadeer Zadran on 2/22/2024
I recently had the pleasure of taking Gianni's API class, and I must say it exceeded my expectations in every way. Gianni's teaching style is excellent, making even the most intricate concepts easy to grasp and apply. His attention to detail and depth of knowledge are truly impressive. The course content was incredibly comprehensive, covering everything from the basics of API testing to advanced techniques. Gianni provided clear explanations, practical examples, and real-world scenarios that made the material both engaging and relevant. It's evident that he has a deep understanding of the subject matter and a passion for sharing his expertise with others. Having previously taken Gianni's Selenium WebDriver 4, Cucumber BDD, Java & More course, I knew I was in good hands. Just like before, Gianni delivered an exceptional learning experience that left me feeling confident and well-equipped to tackle real-world challenges. As someone who is always eager to expand my skill set, I can't help but hope that Gianni will consider creating classes for database testing and Playwright, preferably with Java. Given his track record of excellence, I have no doubt that such courses would be incredibly valuable to students like myself. In conclusion, I highly recommend Gianni's API class to anyone looking to deepen their understanding of API testing. With his expertise, enthusiasm, and dedication to student success, it's truly a class above the rest.
By Joseph T. on 1/31/2024
Perfect course if you wish to learn quickly about the most important concepts in Postman. The teacher speaks clearly, and explains the topics well.
Quality Score
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Overall Score : 96 / 100












