laravel where to define {{route()}} code example

Example 1: call laravel route js

function confirmDelete(id){
    let url = "{{ route('getDeleteRequest', ':id') }}";
    url = url.replace(':id', id);
    document.location.href=url;
}

Example 2: laravel route

Route::get('posts/{post}/comments/{comment}', function ($postId, $commentId) {
    //
});