Learn JavaScript for Postman API testing - Full Course for Beginners

This complete JavaScript tutorial for beginners learning API testing with Postman will teach you everything you need to know to get started with writing JavaScript code in Postman.
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Mock responses used in the video:

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⭐️ Video contents ⭐️

⌨️ 0:00:00 - Introduction
⌨️ 0:00:38 - Where to write scripts
⌨️ 0:01:49 - JavaScript variables
⌨️ 0:06:13 - let vs const
⌨️ 0:07:57 - Data types in JavaScript
⌨️ 0:09:07 - Concatenating strings
⌨️ 0:11:17 - Conditional IF
⌨️ 0:16:52 - Functions
⌨️ 0:26:25 - Objects
⌨️ 0:39:25 - JSON vs JavaScript
⌨️ 0:43:15 - Copying an object
⌨️ 0:45:26 - Arrays
⌨️ 0:56:26 - Iterating over arrays (loops)
⌨️ 1:05:45 - Send HTTP request from scripts
⌨️ 1:10:49 - Parsing JSON response
⌨️ 1:27:25 - Conclusion and next steps

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[paulc]

Hi Valentin,

Great video.

For people getting started with json data, there is a great extension for VS code called JSON Path.

If you copy the json response data into VS Code, it allows to you click on the property you want to get and it will give you the path to it. You can also copy the path to the clipboard so you can paste it back into postman.

Keep up the great work.

[akshitsharma]

Thanks a lot for this tutorial I was looking for just enough concepts to get started with writing test scripts in Postman. This video is exactly what I need short and precise

[trevorribbans]

you're legitimately the only guy with postman tutorials haha thank god for you. Everyone I click on is you 😂

[arijitdutta]

Finally, I am now able to write test scripts in Postman. Thanks a lot Valentina for this tutorial which you made it quite easy to understand. I would like to recommend every beginner to watch this video.

[LuisReyes-thfg]

Another Great Video Valentin!!! Thank you so much for this video and for explaining this in such simple language for beginners to understand.

[annietran]

I had no knowledge of programming languages when i tried to learn postman the first time. But after watching your videos, i can write some Test scripts with postman. Thank you. Everything is still difficult but i believe I can make it better everyday

[Christmastwenty]

Hi Valentin,
I have watched many tutorials about JavaScript and not even its utilisation with postman.
But yours is the first one that I trully, fully and completely understand !
Thank you so much for posting !!

[mstanford]

Hello Valentin, you have a great talent for simplifying concepts that others tend to complicate. Thank you for sharing your knowledge!

[prashanthipurnimasriram]

Hi Valentin. Thank you so much for the detailed explanation video. This is so helpful.

[catangle]

I really love the way you explain everything so basically and easily to understand for beginners like me. I found many suitable videos for me to learn api and Postman here. Nobody knows this is my first comment on Youtube and it's just for you.😁

[jessiewarain]

awesome tutorial thanks valentin very informative!

[conangoinham]

Hi valentin! Thanks for sharing this video. It's definitely an improvement over the JS fundamentals video in your Udemy course on Postman. Maybe you consider replacing that section in Udemy with this updated version? The only part that I wish you'd spent more time on was the "loop" section. At 57:15 you introduced loop concepts with the structure of for (let i=0) etc but then quickly abandoned this structure by saying there's an easier way of doing it. Conceptually I understand that you're telling us this way gives you more control over how you iterate over the data structure, while "forEach" accomplishes the same thing. I still would have liked to see an example given for 3-4 minutes before moving on.

Otherwise wonderful video and I really appreciate you sharing with us!

[jawaharm]

Actually looking for this course. Thank you

[kianaahmadi]

Thanks a lot for this tutorial. It was great!

[SiThu-wydx]

Hello Valentin,

Great Video tutorial.
At the same time I got the knowledge and experience that API hit using postman, JavaScript language sentence, json fetch data knowledge and more and more.
Thank you so much for this video tutorial. And then your teaching style is excellent and awesome!.
May I request video tutorial for Kubernetes zero to hero course.

[deepalways]

just too good ..thanks for the detailed intro :)

[tigeressxxx]

Thank you so much Valentin for such a nice video! Really helped me. God bless you. Looking to learn more in Postman API automation - JS

[akashrodge]

That is a such great boost to my knowledge

[niveditamirjikar]

Another amazing content of yours👏🏻👏🏻👏🏻 Can you please also do a video on API automation using Mocha, Chai and Supertest using javascript

[jayteecollins]

Hi Valentin, thanks so much for making this video. You explained the javascript in very simple ways and easy to understand. If you are offering javascript for beginner course, I'm willing to enroll myself.