How can `wp_send_json_error` be helpful for debugging AJAX requests in WordPress?

`wp_send_json_error` is invaluable for debugging AJAX requests because it provides a standardized way to communicate issues back to the client-side. Instead of just a silent failure, you can use it to return specific error messages, relevant data (like validation errors or system messages), or even parts of a stack trace (in development environments). By logging the responses in the browser's developer console, developers can quickly pinpoint what went wrong server-side. For example, `wp_send_json_error( 'Database query failed: ' . $wpdb->last_error );` gives immediate feedback on database problems.