XHR powered AJAX before fetch() existed. Still supported for legacy code. Modern web uses fetch() or higher-level libraries (axios, SWR, React Query). If you're writing new XHR code in 2026, use fetch instead.
XHR
Also known as: XMLHttpRequest
Also known as: XMLHttpRequest
XHR powered AJAX before fetch() existed. Still supported for legacy code. Modern web uses fetch() or higher-level libraries (axios, SWR, React Query). If you're writing new XHR code in 2026, use fetch instead.