API Regression Tester is a Chrome extension designed to streamline the process of regression testing for JSON REST APIs. This tool allows users to record real API calls while interacting with a web application and replay them later to identify any changes or regressions in the API responses. Key features include recording sessions, real-time logging of responses, and a user-friendly interface for managing test sessions. The extension also provides functionalities like URL filtering, performance monitoring, and automatic token handling to enhance the testing experience.

The tool captures every API response, enabling users to compare recorded and replayed requests easily. It categorizes results as PASS, FAIL, ERROR, or SLOW, with options to view detailed differences between responses. Users can also manage multiple test sessions, share them with colleagues, and exclude volatile fields from comparison, ensuring a comprehensive testing process. Overall, API Regression Tester is a robust solution for developers looking to maintain API integrity across updates.