How to save data before disconnecting user (socket.io)?

Question

JavaScript

When the user connects, I write different data to and when the user disconnects, I need to write them to NeDB, but with the disconnect event
socket.username = {"auth" : false ......};

socket.on('disconnect', function(){
});

I learn about disconnecting the user when the socket no longer exists and the data too.
How can I write the data to the database then?

Answer 1

After a disconnect, the socket object does not cease to exist, all data in it is preserved.