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Quick Introduction to Postman and API Testing for Beginners (Udemy.com)

Learn Postman and REST API testing real FAST. Learn 80% of what you need in 20% of the time.

Created by: Valentin Despa

Last updated October 2025

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What you will learn

  • Introduction to APIs by using Postman
  • Start using Postman
  • Overview of the HTTP messages
  • Use query parameters, path variables and headers
  • Read/write JSON
  • Write basic API tests
  • Work with Postman variables
  • Create simple workflows
  • Learn HTTP request methods: GET, POST, PATCH & DELETE

How it compares

Against the other 281 rated Udemy courses in Software Testing on CourseDuck:

  • Rating4.7 out of 5higher than 87% of them
  • Reviews23,113#8 of 282 by number of reviews
  • Length3.2 hoursshorter than 74% of them
  • Last updatedOctober 2025more recently than 53% of them

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Course Description

Do you need to learn about Postman & APIs for your new position or for a job interview? 

You are not the first one.  REST APIs are everywhere nowadays but you may not know where to begin. If you are a total beginner to APIs and are looking for a quick introduction to API by using Postman. This course is for you.


What are APIs all about?

Today, all IT systems are interconnected by using APIs, which are a way to exchange data, mostly by using a format call JSON.

However, learning about APIs can easily get confusing. You need to know: different HTTP methods, headers, cookies, dealing with file uploads or authentication with API keys, tokens, OAuth and so much more.

This is where Postman comes in! Postman allows you very quickly to create a request with the required HTTP method and parameters, submit the request and easily inspect the results.

Postman can help if you are developing APIs as well! I have created this course for testing engineers and well as for software developers.

Postman can help you during the development of your API as well as after the API is completed, by running tests that make sure your API is still working as intended.

In this Postman crash course for beginners, we will start exploring the features of Postman, creating requests, and building simple workflows. Then we will continue by writing API tests and automatically running a Postman collection by using the Postman Collection Runner and Newman.


Is this course for me?

If you need to get up to speed with Postman and start using APIs and don't have a lot of time, this course will probably take you very far in a very short time. You don't need much to get started, but you need to invest more than 3 hours. Just watching the content may not be enough to develop the skills needed. You need to do the work and the practice assignments.


So let’s look at what you are going to learn:

  • Start with simple requests

  • Use HTTP methods like GET, POST, PUT & DELETE

  • Understand the difference between GET vs POST.

  • Work with query parameters and path variables

  • Understand HTTP headers

  • Learn to deal with authentication (for example using Bearer token)

  • Start writing API tests with JavaScript

  • Organize tests in collections and share them with your team

  • Run API tests using the collection runner or Newman

So after this course, you will have an overview of Postman and can later decide in which areas you want to learn more.

Excited to learn Postman? Join this course today!


Legal Disclaimer

This course is an independent educational resource and is not endorsed by, affiliated with, or associated with Postman, Inc., or any of its products. Postman is a trademark of Postman, Inc. All product names, logos, and brands mentioned in this course are the property of their respective owners.

This course contains promotional materials.

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Instructor Details

Valentin Despa

I teach IT professionals what I wish I'd known earlier.

My foundation is built on years in the trenches as an Agile Enterprise Software Developer, engineering solutions for everything from fast-paced start-ups and SMBs to large global corporations. I hold recognized roles as an AWS Community Builder, Postman Supernova, and GitLab Hero, alongside a deep history of securing and building major open-source projects.

For over a decade, I've taken that real-world experience and quietly built one of the largest learning communities around API tooling, test automation, and DevOps practices. What started as a side YouTube channel turned into hundreds of thousands of learners, conference talks, and team workshops at companies most IT professionals have heard of.

The thread through all of it is the same: take something that looks intimidating and break it down so anyone can understand it in plain language.

Lately, I've been spending more time on practical AI in the workplace. I look at how teams can leverage AI for both everyday knowledge work and hands-on IT engineering, like coding and testing. I focus on cutting through the hype to figure out how AI actually helps IT professionals get work done, build, and ship faster. New formats, same approach.

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Reviews

4.7

23,113 ratings on Udemy

Select a bar to show only those reviews.Select the bar again to show every rating.

By Kotha Lavanya on 8/28/2026

Yes, it is very good and helpful for conducting the assignments and providing solutions for it

By Denis Barboza on 6/15/2026

The session was very easy to follow and understand. The pacing was good, and the examples helped reinforce the key concepts. Thank you for keeping it practical and engaging.

By Sabin Smlatic on 6/11/2026

As course progressed, content had the expected examples and relevant explanations. (The first few videos were over simplified for someone who already have programming experience.)

By Musfirah Binti Suhaimin on 6/10/2026

I love the explanations because as first time learn this with no tech background, I still can catch up. But, there still gap to improve I believe. I learn this because I m currently plan to be AI Automation Architect using N8N as fulltime career and API tech support as remotely income, but I want to know how API works so I can serve my clients confidently. The hard part on me is on syntax and variables in script. I will continue in Postman Complete Guide, I hope I can understand better.

By Nikola Nenic on 6/2/2026

Really easy to follow along and does a great job at explaining throughout the videos when something new pops up. Also covers any possible risks and mistakes you can make. Great course all in all, I will also buy the longer one after finishing this one.

By Prajwal Golhar on 5/13/2026

The mentor is very good. He has in-depth knowledge of the subject he is teaching. Teaching method is also very engaging and lots of quizzes and assignments give you a good confidence over subject. The course delivers exactly what it says in Title and Description - 80% Knowledge in 20% of the time.

By Perrine Attout on 4/22/2026

Formation très complète et détaillée, avec beaucoup de ressources pour nous aider à approfondir certains points. Je ne suis pas certaine d'avoir compris toutes les commandes de test et la fin me semblait difficile et obscure cependant.

By Antoine Thevenon on 3/31/2026

Bonne approche pour les débutant, bon rappel de l'initialisation du matériel pour les seniors n'ayant pas pratiqués avec Postman depuis un certain temps et bonne structuration de la formation.

By Emily Bell on 2/26/2026

Very easy to follow and understand! I have a very brief background in code (a basic understanding of SQL, HTML, and CSS), so this may be assisting me, but I believe any curious mind should be able to follow along on this course easily.

By Tatsiana Smaliak on 1/16/2026

Nice course - definitely recommend it for beginners! Covers requests creation, adding tests, and learning how to run (collection, monitor, newman). Instructions are clear and easy to follow.

By Surekha Jaiswal on 11/22/2020

Thanks for a great course.

By Anthony Morgan on 11/22/2020

Great overview and food for thought

Showing 12 of 318 reviews

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Quality Score

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Overall Score : 94 / 100