API Testing Using Postman: A Practical Approach for Ensuring Software Quality

Application Programming Interfaces (APIs) have become the backbone of modern software applications, enabling communication between heterogeneous systems such as web, mobile, and cloud-based applications. As APIs play a critical role in data exchange, their correctness, reliability, and performance are essential for overall software quality. This research paper presents a practical study of API testing using the Postman tool. The paper explains the fundamentals of API testing, different HTTP methods, and testing techniques applied using Postman. A real-time case study is conducted on a RESTful API to demonstrate request execution, response validation, and automation capabilities. The study highlights the effectiveness of Postman in detecting defects early, reducing manual testing effort, and supporting Agile and DevOps practices. The results show that Postman is a cost-effective and user-friendly tool for ensuring API quality in modern software development