How to make command replay if you have the right tag in your nickname?

Question

JavaScript

How to make a command that will only work if the right tag is present?
For example:
Command: role
Nickname: [Discord] alez
If, when writing a command, the author has the [Discord] tag in his nickname, then an embed is sent about a successful request, and if not, an embed about an error is sent.

Answer 1

Message.author -> User.username

message.author.user.username.startsWith('[Discord]')

Embed