REST APIs form the backbone of nearly every modern web and mobile application, powering how systems communicate, exchange data, and integrate with third-party services. As organizations increasingly rely on API-driven architectures, the ability to test these APIs thoroughly — for functionality, data integrity, security, and performance — has become a critical skill for software testing professionals.
The Vskills Certified REST API Testing Professional course is a Govt. Certified program that builds practical, hands-on expertise in REST API testing — from foundational concepts and manual testing with tools like Postman, to automation testing using REST Assured, JSON validation, OAuth 2.0 authentication flows, and BDD-based framework development — equipping learners to test APIs with the same rigor used in real-world production environments.
Why Choose Vskills REST API Testing Certification?
The Vskills Certified REST API Testing course is built for testing professionals who want structured, hands-on expertise rather than a surface-level introduction to API concepts.
- Govt. Certified credential — This is a Govt. Certified course, adding recognized credibility to your API testing skill set.
- Covers both manual and automation testing — Learners build practical skills using Postman for manual testing and REST Assured for automation, covering the full spectrum of how REST APIs are validated in real projects.
- Real-world API examples — The curriculum uses recognizable, real-world API scenarios rather than abstract examples, helping learners connect concepts directly to production-like testing situations.
- In-depth JSON and data validation skills — From basic assertions to complex nested JSON parsing and POJO-based serialization/deserialization, learners gain the depth needed to validate even the most complex API responses.
- Authentication and security coverage — Includes OAuth 2.0 authorization flows and grant types, a critical and often overlooked area in API testing.
- Framework and CI/CD exposure — Covers Cucumber BDD framework design, Maven, Git version control, and Jenkins CI integration, giving learners visibility into how API tests fit into real development pipelines.
- Flexible, self-paced e-learning — Study at your own pace with access to structured course material.
- Lifetime validity of certification — No renewal required once certified.
Who Should Enroll
This course is designed for testing professionals, developers, and career-starters who want to build or strengthen their expertise in REST API testing — whether they're testing APIs manually for the first time or looking to build full automation frameworks around them.
- Manual Testers — who currently test applications through the UI and want to expand into API-level testing, gaining hands-on experience with tools like Postman before progressing into automation.
- QA Engineers and SDETs — looking to strengthen their REST Assured skills, deepen their JSON validation expertise, and build production-grade automation frameworks rather than relying on basic scripted tests.
- Automation Testers (UI-focused) — who currently work primarily with Selenium or other UI automation tools and want to expand their test coverage to the API layer, which is often faster and more stable to automate than UI tests.
- Software Developers — who want to understand how their APIs are tested and validated, write more testable endpoints, and collaborate more effectively with QA teams during API design and review.
- Backend Developers — interested in building their own test suites for the APIs they develop, reducing dependency on separate QA cycles for basic validation.
- QA Leads and Test Managers — who oversee API testing strategy across teams and want a stronger technical grounding to guide framework decisions, tool selection, and test coverage planning.
- DevOps and CI/CD Engineers — who want to understand how API test automation integrates into build pipelines using Jenkins, Maven, and Git, to better support test execution within CI/CD workflows.
- Freshers and Computer Science / IT students — building a foundational, job-ready skill set in API testing as an entry point into software testing or QA automation careers.
- Career switchers into QA/Testing — professionals moving from unrelated technical or non-technical roles into software testing, looking for a structured, practical starting point in one of testing's most in-demand specializations.
What You Will Learn
The course takes learners from REST API fundamentals through manual testing, automation, complex data validation, authentication, and full framework/CI-CD integration.
- Core REST API concepts — HTTP methods, status codes, path/query parameters, and headers
- Manual API testing using Postman
- Setting up and building automation test frameworks using REST Assured
- Validating JSON response bodies, headers, and complex nested JSON structures
- Handling dynamic and parameterized JSON payloads for data-driven testing
- Serialization and deserialization using POJO classes
- OAuth 2.0 authentication flows and authorization grant types
- Building BDD-style API test frameworks using Cucumber and Gherkin syntax
- Integrating API test frameworks with Maven, Git, and Jenkins for CI/CD
- Real-world, end-to-end API automation examples using recognizable API scenarios
Career Outcomes
Completing the Vskills Certified REST API Testing course opens up roles across software testing, QA automation, and API-focused development functions, where the ability to test, validate, and automate REST APIs is an increasingly essential and well-compensated skill.
| Job Role |
Industry |
Avg. Salary (India) |
Experience Level |
| Manual/API Test Engineer |
IT Services, Product Companies |
₹4 – ₹7 LPA |
Fresher – 2 years |
| API Automation Tester (REST Assured) |
IT Services, E-commerce |
₹6 – ₹10 LPA |
2 – 4 years |
| SDET (API Focus) |
Product Companies, SaaS |
₹8 – ₹14 LPA |
3 – 6 years |
| QA Automation Engineer (Framework Development) |
IT Services, Fintech |
₹9 – ₹15 LPA |
4 – 7 years |
| QA Lead / Test Manager |
IT Services, Product Companies |
₹14 – ₹22 LPA |
7 – 10 years |
| Test Automation Architect / Consultant |
Consulting, MNC |
₹22 – ₹32+ LPA |
10+ years |
Companies That Hire
IT services firms, product companies, e-commerce platforms, fintech companies, and SaaS providers actively hire professionals skilled in REST API testing to ensure the reliability, security, and performance of their backend systems. Organizations such as TCS, Infosys, Wipro, Accenture, Cognizant, HCLTech, Capgemini, Amazon, Flipkart, Paytm, Razorpay, Zomato, and Swiggy, along with numerous product startups.
REST API Testing Table of Contents
https://www.vskills.in/certification/rest-api-testing-table-of-contents
REST API Testing Practice Test
https://www.vskills.in/practice/rest-api-testing-test
REST API Testing Interview Questions
https://www.vskills.in/interview-questions/rest-api-testing-interview-questions
Domain Expert Interview Series
TABLE OF CONTENT
Module 1: REST API Basics and Terminology
- Introduction to REST API and its role in project architecture
- Understanding GET, POST, PUT, DELETE and CRUD operations
- Path parameters, query parameters, and headers in REST API
- HTTP status codes and response structures
Module 2: Getting Started with REST API Testing
- Introduction to Postman and manual API testing
- Executing GET, POST, PUT, and DELETE requests through Postman
- Validating API responses manually
- Understanding request/response cycles using real-world API examples
Module 3: REST Assured Setup for API Automation Testing
- Setting up a REST Assured Maven project with Java and Eclipse
- Building a basic REST API automation testing framework
- Validating status codes and response structure through automated code
Module 4: Validating REST API Responses
- Assertions on JSON response body and headers
- Parsing JSON response bodies using JSON Path
- Integrating multiple APIs with common JSON response values
- Building end-to-end automation using GET, POST, and PUT methods
- Importance of JUnit/TestNG assertions in response validation
Module 5: Working with Complex JSON Structures
- Understanding nested JSON structures and array notations
- Retrieving JSON array size and elements using JSON Path
- Iterating over JSON array elements
- Retrieving JSON nodes using conditional logic
- Solving real-world business logic using JSON responses
Module 6: Handling Dynamic JSON Payloads
- Importance of dynamic JSON payloads in API testing
- Sending parameters to payloads through tests
- Understanding data providers for parameterization
- Parameterizing API tests with multiple datasets
- Handling static JSON payloads
Module 7: Real-World API Automation Example
- Understanding how a real-world API works end-to-end
- Authentication for API requests
- Creating and validating API resources (GET/POST)
- Defining path parameters in automated code
- Sending attachments using multipart methods
- Combining query and path parameters in a single test
- Parsing complex JSON responses with code logic
- Importance of assertions and HTTP validations
Module 8: OAuth 2.0 Authorization
- Introduction to OAuth 2.0 and different grant types
- Understanding the grant type authorization flow
- Flow procedure for achieving OAuth 2.0 authentication
- Practicing an OAuth 2.0 project end-to-end
Module 9: Automating OAuth 2.0 Authorization Flows
- Performing automation testing for OAuth-based projects
- Integrating UI automation to generate authorization codes
- Formatting and retrieving codes programmatically
- Handling the client credentials grant type
Module 10: Serialization & Deserialization Using POJO Classes
- Understanding serialization and deserialization concepts
- Libraries required to support serialization
- Strategies for parsing complex nested JSON using POJO classes
- Creating POJO classes for nested JSON arrays
- End-to-end automation examples using POJO deserialization
- Solving complex JSON queries using POJO methods
Module 11: Serialization of Input Payloads
- Constructing JSON payloads using POJO classes
- Implementing serialization for real-world API examples
- End-to-end testing with serialization
Module 12: Request and Response Spec Builders
- Significance of spec builders in REST Assured
- Practical implementation of spec builders to optimize code
Module 13: Framework Fundamentals — Maven and BDD Basics
- Importance of Maven in framework development
- Installing and configuring Maven
- Understanding Maven terminology
- Creating and importing a Maven project
- Introduction to Cucumber and Gherkin syntax
- Understanding scenario outlines and step definitions
- Creating a project template in Cucumber
- Understanding automation terminology and regular expressions in feature files
Module 14: Building a Cucumber BDD API Framework
- Creating a Maven project with Cucumber and REST Assured dependencies
- Building feature files for REST Assured API tests
- Building test runner and step definition files
- Implementing reusable components in step definitions
- Data-driven and parameterized API testing using Cucumber
- Using enum classes to remove hardcoded resource details
- Building end-to-end test cases in framework standards
- Implementing hooks for test preconditions
- Generating Cucumber HTML reports
Module 15: CI/CD Integration
- Introduction to Jenkins as a CI tool
- Integrating the API framework into Jenkins
- Setting up parameterized Jenkins jobs for API test execution
Module 16: Version Control with Git
- Introduction to Git and GitHub
- Creating Git configurations and repositories
- Staging, committing, and pushing code
- Working with remote repositories
- Branching and resolving merge conflicts
Module 17: Data-Driven Testing with Excel
- Introduction to Apache POI for Excel integration
- Reading rows, cells, and conditional data from Excel
- Practical exercises on Excel-driven API testing
- Converting data structures into JSON for testing
Module 18: Java Fundamentals for API Automation
- Core Java programming principles
- Classes, objects, and interfaces in Java
- Strings and string manipulation
- Inheritance and its practical applications
- Arrays — single-dimensional and multidimensional
