How to Implement Recovery (Panic Catch) Middleware in Go

Wrap your HTTP handler in a middleware function that calls recover() to catch panics and return a 500 status code instead of crashing the server.

func RecoveryMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		defer func() {
			if err := recover(); err != nil {
				log.Printf("panic recovered: %v", err)
				http.Error(w, "Internal Server Error", http.StatusInternalServerError)
			}
		}()
		next.ServeHTTP(w, r)
	})
}

Apply it to your server with http.ListenAndServe(":8080", RecoveryMiddleware(yourHandler)).

Recovery (Panic Catch) Middleware acts as a safety net for your Go web server. If your code crashes unexpectedly, the middleware catches the crash, logs the error, and sends a standard error message to the user instead of shutting down the entire application. It is like a circuit breaker that prevents a single short from blowing out the whole power grid.