HTTP Redirect Status Code Checker

is-redirect is a lightweight, focused utility package for JavaScript and TypeScript environments that efficiently determines if a given numeric HTTP status code falls within the 3xx redirection range. The current stable version is 2.0.0. As part of Sindre Sorhus's collection of focused utilities, it follows a pragmatic release cadence, with major versions typically signaling significant breaking changes, such as the recent transition to pure ESM. Its primary differentiator is its singular focus and minimal footprint, providing a reliable, dependency-free check for redirect status codes without including additional HTTP client or server logic. It serves as a fundamental building block for applications that need to interpret HTTP responses, such as proxies, web scrapers, or API clients, ensuring correct handling of redirect flows.