Postman Mini-Project | Environment Switching & Data-Driven API Testing with Runner

In this hands-on Postman tutorial, we’ll build a complete mini-project showing how to: ✅ Create multiple environments (QA, Staging) ✅ Switch between environments dynamically ✅ Use CSV/JSON data files to drive API tests ✅ Chain requests and validate responses ✅ Run the entire flow using Postman Collection Runner 00:00 - Intro 00:33 - Scenario overview 01:57 - Deliverables 02:48 - Create multiple environments 06:00 - Create collection 08:02 - Create Login request 14:58 - Create Create user request 19:56 - Create Update user request 22:03 - Create Delete user request 23:34 - Create CSV data file 25:00 - Open and run Collection runner 32:58 - Tips / Common mistakes TAKE THE QUIZ and let me know your Score - https://forms.gle/5H23NCKhqgScm6Ko6 Scenario Overview: You’re testing a User Registration API in two environments — QA and Staging Login and get a token Create multiple users from a CSV/JSON dataset Update/Verify each created user Delete them All requests will be run automatically through the Collection Runner Tools Used: Postman CSV/JSON Files This reflects real QA automation scenarios where teams run the same collection with different datasets and environments Deliverables ✅ Environment setup (QA, Staging, Production) ✅ Postman Collection using variables in endpoints and headers ✅ Data file (users.csv or users.json) with multiple user records End Result: you can perform data-driven testing for multiple inputs and environments Builds the core skills required for enterprise-level API automation Step 1 - Create Multiple Environments QA → baseUrl = https://reqres.in token = (empty) Staging → baseUrl = https://reqres.in token = (empty) ✅ You can now switch between QA and Staging using the dropdown Step 2 - Create a Collection “User Registration Flow - Data Driven” Step 3,4,5 - Add these requests in order: Login Create User Update User Delete User (see video for details of each api request) Step 6 - Create the CSV File users.csv name,job Alice,QA Engineer Bob,Automation Tester Charlie,Developer Step 7 - Run CSV with collection - Open Collection Runner Collection: User Registration Flow - Data Driven Environment: QA or Staging Data File: users.csv Step 8 - Check flow runs for each row in the CSV: Token generated once User created, updated, deleted for each dataset row Change environment and run again Step 6 - View Basic Reports Runner will display: Total requests Passed / Failed tests Test logs and status codes You can also export results as a JSON report Tips / Common Mistakes: ✅ Always select the correct environment before running 🧪 Use {{variable}} syntax in both body and scripts 🚫 Don’t forget to include headers (esp. Authorization) 🧭 CSV column names must match the variable names 🔐 Sensitive data like tokens should not be stored in CSV 🔗 Watch next: 👉 Postman Mini-Project | Token-based Authentication Flow in Postman 👉 Postman Mini-Project | Automating API Test Flow with Postman Collections & Runner #Postman #APITesting #PostmanTutorial ▬▬▬▬▬▬▬ Share with all who may need this If my work has helped you, consider helping any animal near you, in any way you can Never Stop Learning Raghav Pal ▬▬▬▬ USEFUL LINKS ▬▬▬▬ ✅ ALL TUTORIALS - https://AutomationStepByStep.com/ 🙌 Connect with Raghav: Ask Raghav: https://bit.ly/2CoJGWf GitHub: https://github.com/Raghav-Pal Udemy: https://www.udemy.com/user/raghav-pal-3/ Shorts Eng - https://bit.ly/3H9bifV Shorts Hindi - https://bit.ly/3XY7XqN ➡️ Subscribe for more videos:    / @raghavpal   —