← Learning Hub

Video Resources

How API Testing Works: REST APIs, JSON, and Postman

Test REST APIs using Postman and real-world scenarios. Cover HTTP methods, request validation, response codes, authentication, and backend API testing techniques.

Frequently Asked Questions

What this playlist answers

5 questions this playlist covers — skim them for a quick takeaway, or dive into the videos above for the full picture.

API testing validates that application programming interfaces correctly process requests, return accurate responses, and handle errors appropriately. It focuses on backend logic without requiring a user interface. Common HTTP methods include GET for retrieving data, POST for creating records, PUT or PATCH for updating, and DELETE for removing records. Each method maps to a specific data operation in REST architecture. Popular tools include Postman, Insomnia, Swagger, REST Assured, and SoapUI. These tools allow testers to create requests, inspect responses, write assertions, and automate API test execution. Testers validate status codes, response payloads, response time, authentication behavior, error messages, and data accuracy to ensure APIs behave correctly across expected and edge case scenarios. Modern applications rely heavily on APIs to connect services and microservices. Early API testing detects integration issues before they surface in the UI, reducing the cost and complexity of fixing backend defects.
INSIGHTS & FRAMEWORKS

Proprietary research. Actionable frameworks.