Where is the Jid created?

I don’t use any authentication method and the created Jid is a random uuid but I can’t find Jid creation method in jicofo. Is that created in prosody?

The anonymous jids are created in prosody.

In jitsi meet web browser client there is a payload like

<iq type=‘set’ id=’_bind_auth_2’ xmlns=‘jabber:client’>
<bind xmlns=‘urn:ietf:params:xml:ns:xmpp-bind’ />
</iq>

that is sent via post request to the server.
I can find this payload neither in react native codes nor lib-jitsi-meet codes. Does it is sent in the mobile app or just is sent in browser?

This is sent by strophe library we use for xmpp.