REST API Testing for Beginners (Complete Guide)
Learn REST API testing from scratch — no experience required, just a browser and a free tool called Postman.
This beginner's guide to REST API testing walks you through every core concept you need to get started: routes, HTTP methods, status codes, and request bodies. Then we jump into a live Postman demo using a real Express.js API and React frontend that you can run locally. You will send GET, POST, PUT, and DELETE requests, test validation and error handling, and see your changes reflected in the UI in real time. This video is built for QA students, junior testers, and developers who want to understand how API testing actually works on the job.
📂 Download the Anime API used in this video: https://github.com/glitchitsystem/ani...
REST API testing is one of the most in-demand skills in QA right now. Nearly every modern application depends on APIs, and knowing how to test them well — including error scenarios and edge cases — sets you apart in interviews and on the job.
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What You'll Learn
What a REST API is and how routes, methods, status codes, and bodies work together
How to use Postman to send real requests and read responses
How to test validation, error handling, and edge cases intentionally
How to write structured test cases and bug reports from API behavior
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Timestamps
00:00 - Intro — What this video covers
00:38 - What is a REST API?
01:14 - Routes, Methods, Status Codes, and Body
02:10 - Demo setup
03:00 - Swagger UI walkthrough
03:53 - Demo — GET requests in Postman
04:58 - Demo — POST and seeing results in the React UI
05:59 - Demo — PUT and DELETE
07:14 - Demo — Validation error testing
08:15 - Auth and Headers
09:59 - Importing Swagger spec into Postman
10:35 - Writing test cases and bug reports
12:15 - Conclusion and next steps
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Resources & Links
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→ https://glitchitsystem.com/
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FREE RESOURCES FOR QA PROFESSIONALS
📋 Grab my Free QA Prompt Pack: https://glitchitsystem.com/signup/
Perfect for requirements review, test case design, and bug spotting. Get instant access to templates used by professional QA teams.
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💻 TOOLS I RECOMMEND
Some links below are affiliate links. I may earn a small commission if you purchase through them, at no extra cost to you.
Screen Capture Tool (SnagIt): https://techsmith.z6rjha.net/c/180812...
Perfect for documenting bugs and creating test evidence.
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SiteGround Web Hosting: https://www.siteground.com/index.htm?...
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Tags
REST API testing, API testing for beginners, Postman tutorial, manual API testing, software testing, QA engineer, HTTP methods, API testing tutorial, how to test an API, status codes explained, quality assurance, beginner QA, test cases, bug reports, Postman beginner guide
#QATesting #APItesting #SoftwareTesting