Postman API Automation: Dynamic Variables & Advanced Assertions | Lecture 5 | Tech Bharat
In this 5th lecture of our 2026 API Testing series, we dive deep into making your Postman collections smarter and more resilient. A common issue in API testing is data duplication (the "Book already exists" error). Today, we solve that using Dynamic Variables and Pre-request Scripts.
What you will learn in this session:
Dynamic ISBN Generation: How to use JavaScript in Pre-request scripts to generate random, unique IDs every time you hit the API.
Variable Scopes: Mastering Global vs. Collection level variables for cleaner automation.
Advanced Assertions: * Validating JSON response bodies for specific success messages.
Verifying Response Headers (Content-Type validation).
Performance Testing: Setting up assertions to ensure response times are under specific thresholds (e.g., 1200ms).
Header & Text Inclusion: Checking if specific strings exist within the response body.
Q&A Session: Real-world troubleshooting of environment switching and load testing basics.
Timestamps
0:00 - Introduction & Recap
0:35 - Handling "Book Already Exists" Error
2:15 - Setting Global Variable Prefixes
4:10 - Writing Pre-request Scripts for Random Data
7:45 - Dynamic ISBN & Collection Variables
10:30 - Asserting JSON Response Body
12:50 - Header Validation (Content-Type)
15:15 - Performance Assertions (Response Time)
17:40 - Text Inclusion Assertions
19:00 - Student Q&A: Load Testing & Environments
Tags
Postman API Automation API Testing 2026 Software Testing Tutorial Postman Pre-request Scripts Dynamic Variables Postman JSON Assertions API Performance Testing Postman Collection Variables QA Automation Tech Bharat Software Testing Interview Questions REST API Testing Postman Header Validation Postman Global Variables
🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟣🟣🟣🟣
Full Playlist for software testing jobs: • Software Testing Job/QA/Manual /Automation...
Selenium with Java series: • Selenium with java | Automation testing 20...
Core Java Series: • Java Basic Introduction for Beginners | Co...
Software testing interview Question series: • Core Java frequently asked Interview Quest...
Shorts on Software testing: • Software testing shorts | 1 minute Softwar...
🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟣🟣🟣🟣
🔷🔷🔷🔷🔹🔹🔷🔷 Follow us on our social media platforms 🔷🔷🔷🔷🔷🔷
💻 Stay connected and follow us on social media:
YouTube: / @techbharat12
*WhatsApp Group:https://chat.whatsapp.com/LQQXOllITQZ...
LinkedIn: / rajat-bhatti
/ techbharat1
Instagram: https://www.instagram.com/tech_bharat...
Telegram: https://t.me/thetechbharat
Fb: / aadrakwalichai
Website: http://thetechbharat.com/
Contact: 9050358180 (Rajat)
🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟢🟣🟣🟣🟣
****************************************************
#software
#softwaretesting
#softwaretestingjobs
#softwaretestingjobs
#workfromhomejobs
#softwaretestingjobs
#testingjobs #fresherjobs #automationtestingjobs #shortvideo #shorts #shortvideos #testingjobs
tech bharat testing,
******************************************************************************
Welcome to Tech Bharat, where we share insights and tips on both manual and automated testing. Our goal is to enhance your software testing skills and ensure high-quality software through effective testing practices. Join us in exploring the best methods and tools to make your testing process more efficient and reliable.