[Vuejs]-Passing data to the modal in Vue not working

The problem is that you are trying to use document in the created handler of the component which is far too early in its life-cycle.

Instead, one approach is to use a watch handler in your UserModal like this:

watch: {
    document: function () {
        console.log(this.document);
        if (this.document) {
            this.fetchUsers(this.document);
        }
    }
}

Try to declare your prop like so:

props: {
  document: Object
}