@endel Thanks for your answer . I use this solution for set data to setMetadata and This code work well:

Client side (local):

room = client.join('create_or_join', { create: true, name:'hi2020', gametype:1 });

Server side (TS file):

onInit (options) {
this.setMetadata({
name: options.name,
gametype: options.gametype,
});}

@mdotedot
How can I set setMetadata on server and client ?

I try below Code but didn't work and receive this Error from browser
"Uncaught TypeError: room.setMetadata is not a function
at create (04-create-or-join-room.html:70)
at HTMLButtonElement.onclick (04-create-or-join-room.html:30)"

client side (Local):

function create () {
     room = client.join('create_or_join', { create: true });
    addListeners(room);
    room.setMetadata('hihi');
      
  }

Client side (Server):

setMetadata(meta){
    console.log("setMetadata ");
}

Do you have any suggestion ?

@mdotedot Thanks for your response it's great!

@h4ss4n answer of my first question: This variable _maxClientsReached hold status of room .

I'm newbie in Colyseus and i would like to say sorry for my poor English, I want create a play Cards game with Node.js and HTML.
I have some question :
How can i get count of user exist in the room?
How can i get name and link of rooms ?