API Rate Limiter is a Chrome extension designed for developers and engineers to simulate API rate limiting effectively. It allows users to intercept fetch and XHR requests, returning customizable error responses like '429 Too Many Requests' and '503 Service Unavailable'. This tool is particularly useful for frontend developers testing their applications for rate limit handling, API consumers verifying retry logic, and QA engineers simulating degraded API conditions. The extension enables users to set specific URL patterns, request limits, and time windows for throttling requests, ensuring a realistic testing environment without impacting real APIs.

Key features of the API Rate Limiter include visual progress bars for tracking request limits, configurable response options, and the ability to toggle rules on and off without deletion. Additionally, users can view logs of throttled requests, reset counters, and import or export rule sets in JSON format. With a strong emphasis on privacy, the extension stores all data locally, ensuring no information is sent to external servers, providing a secure and efficient tool for developing resilient client-side code.