Developed and integrated a comprehensive Postman API testing collection for the uw-coursemap repository, focusing on improving the reliability and efficiency of API validation. Leveraging skills in API testing and Postman, the work involved creating a standardized JSON-based test suite that enables developers to run repeatable, automated checks against API endpoints. This approach streamlined local development and pull request reviews by reducing manual testing and minimizing the risk of regressions. By providing ready-to-use test scripts, the contribution enhanced onboarding for new developers and expanded overall testing coverage, supporting a more robust and maintainable API development workflow within the project.