Check if an user is a voice, half-operator, operator,...

[Frostman98]

It's possible to have a user info if he is a voice, half-operator, operator,...?

[del6597]

You should bind to the NAMES event when joining a channel and then keeping track of the MODE changes that occur in the channel.
https://node-irc.readthedocs.org/en/latest/API.html#%27names%27

This event gives the list of nicks and the highest status that they currently have in the channel. Most IRCds will not give you a full list of usermodes when submitting a NAMES command to the server. For example: if I am in a channel with operator status and I grant myself half-operator and voice, then users in the channel will see those +h and +v mode changes. The users joining the channel will only be told that I have operator status by the server however.

There is no API level method for checking directly if someone has a status, but that doesn't mean you are unable to keep track of the information yourself.