Learn API testing from scratch using Postman, the industry-standard tool for REST API validation. This course is designed for QA professionals, beginners in testing, and developers looking to understand how APIs work and how to validate them effectively. By the end of this course, students will be able to perform end-to-end API testing, automate checks, and integrate API tests into a CI/CD pipeline.

👩‍🏫 Who is this course for?

• Manual testers looking to transition into API automation

• QA professionals and software engineers aiming to upskill

• Freshers or non-programmers interested in learning practical API testing

• Anyone who wants to build confidence in RESTful API validation using Postman

🧪 Course Topics

🔹 Introduction to API Testing & Postman

• What is an API? Understanding RESTful APIs

• Overview of Postman Interface

• Installing and using Postman (desktop & web)

• HTTP methods (GET, POST, PUT, PATCH, DELETE)

• Basic structure of an API request and response

🔹 Working with Postman Collections

• Creating, saving, and running collections

• Using collection and environment variables

• Query parameters vs path variables

• Headers and authorization (Basic Auth, Bearer Tokens, OAuth2)

🔹 Request Building & Data Handling

• Sending requests and visualizing responses

• JSON format and request body handling

• Troubleshooting failed requests

• Using dynamic and random data

• Handling status codes and response validation

🔹 Assertions & Tests in Postman

• Writing basic to intermediate test scripts using JavaScript

• Using Chai Assertion Library

• Validating response status, body, headers, and data types

• Boundary testing and error response handling

• Organizing tests for reusability and reducing duplication

🔹 Data-Driven Testing

• Using external data files (JSON, CSV)

• Parameterization and test iteration with Collection Runner

• Passing data between requests using scripts

🔹 Variables & Scripting in Postman

• Pre-request scripts and test scripts

• Local, global, environment, and collection variables

• JavaScript basics for testers (variables, functions, arrays, conditionals)

• Parsing and navigating complex JSON data

🔹 Working with Real APIs

• Reading and interpreting API documentation

• Simulating business workflows with chained API calls

• Creating and managing resources (CRUD operations)

• Using identifiers, IDs, and handling dynamic data

🔹 Mock Servers & Advanced Tools

• Introduction to mock servers

• When and why to use them in testing

• Creating and testing with mock APIs

🔹 Running Tests in CI/CD

• Introduction to Postman CLI and Newman

• Running collections via Command Line

• Generating HTML & JUnit reports

• Integrating Postman tests with Jenkins (freestyle & Jenkinsfile)

• Managing secrets and environment configs in CI

💻 What do students need to bring?

• A laptop with internet access

• Postman installed (desktop version preferred)

• Basic understanding of software testing is a plus, but not required

• A notebook for notes and a positive learning attitude

🎯 What will you gain by the end of the course?

• Strong understanding of API testing concepts and workflows

• Hands-on experience building, executing, and automating API tests

• Ability to validate APIs with dynamic data, assertions, and test chaining

• Skills to integrate API testing into a CI/CD pipeline using Jenkins and Newman

• Confidence to work on real-world API projects and attend technical interviews