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API Testing

Master the fundamentals of API testing and build job-ready skills to validate RESTful services using Postman through structured learning, hands-on practice, and real-world scenarios.

  • Learn API testing fundamentals through clear, structured skill sprints

  • Work with REST APIs, HTTP methods, and real-world testing scenarios

  • Practice hands-on API testing using Postman collections and environments

  • Build job-ready skills in API validation, automation, and data-driven testing

  • Intermediate-friendly – no programming experience required

Target Audience

  • Manual testers looking to transition into API testing

  • QA professionals and automation testers expanding their backend testing skills

  • Developers who want to validate and test APIs during development

  • IT professionals interested in learning API testing and backend validation concepts

  • Career starters exploring opportunities in QA and software testing roles

  • Anyone interested in learning how to test REST APIs using Postman

Learning Highlights

  • Learn API testing for real-world applications and backend validation

  • Delivered using OCA’s Skill Sprint™ Method with hands-on practice and instructor-led feedback

  • Work with industry-standard tool: Postman for API testing and automation

  • Apply REST API concepts and HTTP methods in practical scenarios

  • Build automated and data-driven API test workflows

  • Develop job-ready API testing and QA skills

  • Complete an end-to-end API testing project

API Testing with Postman Overview

API Testing with Postman is a practical, intermediate-level program designed to build strong skills in testing and validating RESTful APIs using Postman. The course provides a clear and structured approach to understanding API concepts and backend testing without unnecessary complexity, making it suitable for QA professionals, developers, and individuals expanding their testing capabilities.

Through guided learning and hands-on practice, participants develop an understanding of how APIs function, how data flows between systems, and how to validate API behavior effectively. The program covers REST fundamentals, HTTP methods, request and response handling, authentication techniques, and Postman-based testing workflows. Emphasis is placed on structured testing approaches, real-world API scenarios, and applying testing techniques to practical use cases.

Upon completion, learners possess the practical skills required to test APIs for functionality, reliability, and performance. The program also builds a strong foundation for advanced QA automation paths, enabling learners to expand into automation frameworks and integrate API testing into end-to-end testing strategies.

Prerequisites

The following basic skills are recommended to maximize learning outcomes:

  • Comfort using a computer (file navigation, browser usage, basic typing)

  • Familiarity with web applications and basic computer tools

  • Basic understanding of software testing or application workflows (helpful but not required)

  • Interest in backend systems, APIs, and problem-solving

  • Willingness to learn API testing concepts and complete hands-on exercises

Outcomes

By the end of this course, you will be able to:

  • Understand REST APIs and how backend services communicate with applications

  • Explain HTTP methods, status codes, headers, and request/response structures

  • Create, organize, and manage API requests using Postman

  • Test RESTful APIs for functionality, accuracy, and reliability

  • Validate API responses using assertions and scripts in Postman

  • Handle authentication mechanisms such as API keys and bearer tokens

  • Use environments and variables to create dynamic and reusable API tests

  • Perform data-driven API testing using external data files

  • Execute automated API test collections using Postman Runner

  • Identify and report API defects effectively

  • Apply API testing practices in real-world QA and development projects

  • Build a strong foundation to progress into advanced QA automation and testing frameworks

Job Roles & Careers

This course prepares learners for entry-level and intermediate roles in API testing and quality assurance. After completing the training, learners will be better prepared for positions such as:

  • API Tester

  • QA Engineer (API Testing)

  • Software Test Engineer

  • Automation Tester (API-Focused)

  • Backend QA Engineer

  • Quality Assurance Analyst

  • Test Engineer (API & Integration Testing)

Curriculum

This course follows our proprietary OCA Skill Sprint Method — a structured approach focused on clear goals, hands-on practice, real-world application, and measurable performance.

$1,099   
  • Instructor-Led: Live Online

  • 24 Total Hours

  • Intermediate Level

  • Real-World Projects

  • Career-Focused

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Why This Course Is in Demand

As modern applications increasingly rely on APIs and microservices, API testing has become a critical skill across software development, cloud platforms, mobile applications, and enterprise systems. Organizations depend on APIs to enable seamless integration, data exchange, and service communication, making reliable API testing essential for ensuring performance, security, and system stability.

As API-first development and microservices architectures become standard across industries, professionals are expected to understand how backend systems function and how to validate them effectively. Skills in API testing, Postman, automation, and data validation are now highly valued in QA and development teams focused on delivering high-quality software.

This course addresses the growing demand for:

  • API testing skills for backend and microservices-based applications

  • QA professionals expanding beyond UI testing into API validation

  • Teams adopting API-first and integration-driven development approaches

  • Organizations aiming to detect defects early in the development lifecycle

  • Professionals building strong foundations for QA automation and testing careers

API testing is no longer optional — it is a core skill for modern software quality and reliability.